{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,1]],"date-time":"2026-05-01T09:05:28Z","timestamp":1777626328302,"version":"3.51.4"},"reference-count":64,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2021,5,26]],"date-time":"2021-05-26T00:00:00Z","timestamp":1621987200000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/100014440","name":"Ministerio de Ciencia, Innovaci\u00f3n y Universidades","doi-asserted-by":"publisher","award":["RTI2018-100912-B-I00"],"award-info":[{"award-number":["RTI2018-100912-B-I00"]}],"id":[{"id":"10.13039\/100014440","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100008530","name":"European Regional Development Fund","doi-asserted-by":"publisher","award":["RTI2018-100912-B-I00"],"award-info":[{"award-number":["RTI2018-100912-B-I00"]}],"id":[{"id":"10.13039\/501100008530","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Brain\u2013computer interfaces (BCI) are a type of assistive technology that uses the brain signals of users to establish a communication and control channel between them and an external device. BCI systems may be a suitable tool to restore communication skills in severely motor-disabled patients, as BCI do not rely on muscular control. The loss of communication is one of the most negative consequences reported by such patients. This paper presents a BCI system focused on the control of four mainstream messaging applications running in a smartphone: WhatsApp, Telegram, e-mail and short message service (SMS). The control of the BCI is achieved through the well-known visual P300 row-column paradigm (RCP), allowing the user to select control commands as well as spelling characters. For the control of the smartphone, the system sends synthesized voice commands that are interpreted by a virtual assistant running in the smartphone. Four tasks related to the four mentioned messaging services were tested with 15 healthy volunteers, most of whom were able to accomplish the tasks, which included sending free text e-mails to an address proposed by the subjects themselves. The online performance results obtained, as well as the results of subjective questionnaires, support the viability of the proposed system.<\/jats:p>","DOI":"10.3390\/s21113716","type":"journal-article","created":{"date-parts":[[2021,5,26]],"date-time":"2021-05-26T21:56:44Z","timestamp":1622066204000},"page":"3716","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":26,"title":["Brain\u2013Computer Interface (BCI) Control of a Virtual Assistant in a Smartphone to Manage Messaging Applications"],"prefix":"10.3390","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5235-5597","authenticated-orcid":false,"given":"Francisco","family":"Velasco-\u00c1lvarez","sequence":"first","affiliation":[{"name":"Departamento de Tecnolog\u00eda Electr\u00f3nica, Universidad de M\u00e1laga, 29071 M\u00e1laga, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3421-976X","authenticated-orcid":false,"given":"\u00c1lvaro","family":"Fern\u00e1ndez-Rodr\u00edguez","sequence":"additional","affiliation":[{"name":"Departamento de Tecnolog\u00eda Electr\u00f3nica, Universidad de M\u00e1laga, 29071 M\u00e1laga, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Francisco-Javier","family":"Vizca\u00edno-Mart\u00edn","sequence":"additional","affiliation":[{"name":"Departamento de Tecnolog\u00eda Electr\u00f3nica, Universidad de M\u00e1laga, 29071 M\u00e1laga, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Antonio","family":"D\u00edaz-Estrella","sequence":"additional","affiliation":[{"name":"Departamento de Tecnolog\u00eda Electr\u00f3nica, Universidad de M\u00e1laga, 29071 M\u00e1laga, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8721-0585","authenticated-orcid":false,"given":"Ricardo","family":"Ron-Angevin","sequence":"additional","affiliation":[{"name":"Departamento de Tecnolog\u00eda Electr\u00f3nica, Universidad de M\u00e1laga, 29071 M\u00e1laga, Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,5,26]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"942","DOI":"10.1016\/S0140-6736(10)61156-7","article-title":"Amyotrophic lateral sclerosis","volume":"377","author":"Kiernan","year":"2011","journal-title":"Lancet"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"717","DOI":"10.1016\/S0140-6736(16)00339-1","article-title":"Guillain-Barr\u00e9 syndrome","volume":"388","author":"Willison","year":"2016","journal-title":"Lancet"},{"key":"ref_3","first-page":"47","article-title":"Assistive Technology for Individuals with Disabilities: A Review and Synthesis of the Literature","volume":"21","author":"Alper","year":"2006","journal-title":"J. Sp\u00e9c. Educ. Technol."},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Jamwal, R., Jarman, H.K., Roseingrave, E., Douglas, J., and Winkler, D. (2020). Smart home and communication technology for people with disability: A scoping review. Disabil. Rehabil. Assist. Technol., 1\u201321.","DOI":"10.1080\/17483107.2020.1818138"},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Elsahar, Y., Hu, S., Bouazza-Marouf, K., Kerr, D., and Mansor, A. (2019). Augmentative and Alternative Communication (AAC) Advances: A Review of Configurations for Individuals with a Speech Disability. Sensors, 19.","DOI":"10.20944\/preprints201903.0033.v1"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"767","DOI":"10.1016\/S1388-2457(02)00057-3","article-title":"Brain\u2013computer interfaces for communication and control","volume":"113","author":"Wolpaw","year":"2002","journal-title":"Clin. Neurophysiol."},{"key":"ref_7","first-page":"1","article-title":"Combining brain-computer interfaces and assistive technologies: State-of-the-art and challenges","volume":"1","author":"Rupp","year":"2010","journal-title":"Front. Neurosci."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"1211","DOI":"10.3390\/s120201211","article-title":"Brain Computer Interfaces, a Review","volume":"12","year":"2012","journal-title":"Sensors"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"108918","DOI":"10.1016\/j.jneumeth.2020.108918","article-title":"A comprehensive assessment of Brain Computer Interfaces: Recent trends and challenges","volume":"346","author":"Yadav","year":"2020","journal-title":"J. Neurosci. Methods"},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Rezeika, A., Benda, M., Stawicki, P., Gembler, F., Saboor, A., and Volosyak, I. (2018). Brain\u2013Computer Interface Spellers: A Review. Brain Sci., 8.","DOI":"10.3390\/brainsci8040057"},{"key":"ref_11","doi-asserted-by":"crossref","unstructured":"Monobe, K., Matsubara, A., and Nishifuji, S. (2019, January 15\u201318). Impact of Characteristics of Noise Added to Auditory Stimulus on Auditory Steady-State Response. Proceedings of the 2019 IEEE 8th Global Conference on Consumer Electronics (GCCE), Osaka, Japan.","DOI":"10.1109\/GCCE46687.2019.9015536"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"2128","DOI":"10.1016\/j.clinph.2007.04.019","article-title":"Updating P300: An integrative theory of P3a and P3b","volume":"118","author":"Polich","year":"2007","journal-title":"Clin. Neurophysiol."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"510","DOI":"10.1016\/0013-4694(88)90149-6","article-title":"Talking off the top of your head: Toward a mental prothesis utilizing event-relatedpotencials","volume":"70","author":"Farwell","year":"1988","journal-title":"Electroencephalogr. Clin. Neurophysiol."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"101687","DOI":"10.1016\/j.bspc.2019.101687","article-title":"A hybrid BCI-controlled smart home system combining SSVEP and EMG for individuals with paralysis","volume":"56","author":"Chai","year":"2020","journal-title":"Biomed. Signal Process. Control."},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"519","DOI":"10.1109\/TNSRE.2019.2961309","article-title":"EEG- and EOG-Based Asynchronous Hybrid BCI: A System Integrating a Speller, a Web Browser, an E-Mail Client, and a File Explorer","volume":"28","author":"He","year":"2020","journal-title":"IEEE Trans. Neural Syst. Rehabil. Eng."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"552","DOI":"10.1080\/00140139.2012.661083","article-title":"Light on! Real world evaluation of a P300-based brain\u2013computer interface (BCI) for environment control in a smart home","volume":"55","author":"Carabalona","year":"2012","journal-title":"Ergonomics"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"861","DOI":"10.1007\/s11517-014-1191-5","article-title":"A P300-based brain\u2013computer interface aimed at operating electronic devices at home for severely disabled people","volume":"52","author":"Corralejo","year":"2014","journal-title":"Med. Biol. Eng. Comput."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"416","DOI":"10.3389\/fnhum.2016.00416","article-title":"Feasibility of BCI Control in a Realistic Smart Home Environment","volume":"10","author":"Kosmyna","year":"2016","journal-title":"Front. Hum. Neurosci."},{"key":"ref_19","first-page":"27","article-title":"Implementation of an Embedded Web Server Application for Wireless Control of Brain Computer Interface Based Home Environments","volume":"40","author":"Bay","year":"2015","journal-title":"J. Med. Syst."},{"key":"ref_20","doi-asserted-by":"crossref","unstructured":"Hsieh, K.L., Sun, K.T., Yeh, J.K., and Pan, Y.U. (2017, January 13\u201317). Home care by auditory Brain Computer Interface for the blind with severe physical disabilities. Proceedings of the 2017 International Conference on Applied System Innovation (ICASI), Sapporo, Japan.","DOI":"10.1109\/ICASI.2017.7988473"},{"key":"ref_21","doi-asserted-by":"crossref","unstructured":"Shivappa, V.K.K., Luu, B., Solis, M., and George, K. (2018, January 14\u201317). Home automation system using brain computer interface paradigm based on auditory selection attention. Proceedings of the 2018 IEEE International Instrumentation and Measurement Technology Conference (I2MTC): Discovering New Horizons in Instrumentation and Measurement, Houston, TX, USA.","DOI":"10.1109\/I2MTC.2018.8409863"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"155","DOI":"10.1016\/j.eswa.2018.11.026","article-title":"Towards an accessible use of smartphone-based social networks through brain-computer interfaces","volume":"120","author":"Hornero","year":"2019","journal-title":"Expert Syst. Appl."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"163604","DOI":"10.1109\/ACCESS.2019.2952613","article-title":"Development of an Online Home Appliance Control System Using Augmented Reality and an SSVEP-Based Brain\u2013Computer Interface","volume":"7","author":"Park","year":"2019","journal-title":"IEEE Access"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"103618","DOI":"10.1016\/j.compbiomed.2020.103618","article-title":"A self-paced BCI prototype system based on the incorporation of an intelligent environment-understanding approach for rehabilitation hospital environmental control","volume":"118","author":"Liu","year":"2020","journal-title":"Comput. Biol. Med."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1155\/2020\/1843269","article-title":"Towards an Accessible Use of a Brain-Computer Interfaces-Based Home Care System through a Smartphone","volume":"2020","author":"Sun","year":"2020","journal-title":"Comput. Intell. Neurosci."},{"key":"ref_26","doi-asserted-by":"crossref","unstructured":"Heo, D., Kim, M., Kim, J., Choi, Y.-J., and Kim, S.-P. (2021). Effect of Static Posture on Online Performance of P300-Based BCIs for TV Control. Sensors, 21.","DOI":"10.3390\/s21072278"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"1034","DOI":"10.1109\/TBME.2004.827072","article-title":"BCI2000: A General-Purpose Brain-Computer Interface (BCI) System","volume":"51","author":"Schalk","year":"2004","journal-title":"IEEE Trans. Biomed. Eng."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"81","DOI":"10.1080\/02763869.2018.1404391","article-title":"Alexa, Siri, Cortana, and More: An Introduction to Voice Assistants","volume":"37","author":"Hoy","year":"2018","journal-title":"Med. Ref. Serv. Q."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"921","DOI":"10.1080\/02699052.2020.1763462","article-title":"Mainstream technology to support basic communication and leisure in people with neurological disorders, motor impairment and lack of speech","volume":"34","author":"Lancioni","year":"2020","journal-title":"Brain Inj."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"388","DOI":"10.1212\/WNL.55.3.388","article-title":"Quality of life in ALS depends on factors other than strength and physical function","volume":"55","author":"Simmons","year":"2000","journal-title":"Neurology"},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"456","DOI":"10.3109\/17482960802444840","article-title":"The SEIQoL-DW for assessing quality of life in ALS: Strengths and limitations","volume":"10","author":"Felgoise","year":"2009","journal-title":"Amyotroph. Lateral Scler."},{"key":"ref_32","unstructured":"WhatsApp (2021, February 10). Two Billion Users\u2014Connecting the World Privately, WhatsApp Blog. Available online: https:\/\/blog.whatsapp.com\/two-billion-users-connecting-the-world-privately."},{"key":"ref_33","unstructured":"Telegram (2021, February 10). 400 Million Users, Telegram Blog. Available online: https:\/\/telegram.org\/blog\/400-million."},{"key":"ref_34","unstructured":"Statista (2021, February 10). Number of E-Mail Users Worldwide, Statista. Available online: https:\/\/www.statista.com\/statistics\/255080\/number-of-e-mail-users-worldwide\/."},{"key":"ref_35","unstructured":"Statista (2021, February 10). Number of Smartphone Users Worldwide. Statista. Available online: https:\/\/www.statista.com\/statistics\/330695\/number-of-smartphone-users-worldwide\/."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"127","DOI":"10.1016\/j.cmpb.2019.02.015","article-title":"UMA-BCI Speller: An easily configurable P300 speller tool for end users","volume":"172","year":"2019","journal-title":"Comput. Methods Programs Biomed."},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"1533","DOI":"10.1053\/apmr.2001.26621","article-title":"Brain-computer communication: Self-regulation of slow cortical potentials for verbal communication","volume":"82","author":"Neumann","year":"2001","journal-title":"Arch. Phys. Med. Rehabil."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"7","DOI":"10.1186\/1743-0003-11-7","article-title":"Toward brain-computer interface based wheelchair control utilizing tactually-evoked event-related potentials","volume":"11","author":"Kaufmann","year":"2014","journal-title":"J. Neuroeng. Rehabil."},{"key":"ref_39","unstructured":"(2020, September 02). User Reference:P300Classifier. Available online: https:\/\/www.bci2000.org\/mediawiki\/index.php\/User_Reference:P300Classifier."},{"key":"ref_40","doi-asserted-by":"crossref","unstructured":"Xu, L., Xu, M., Jung, T.-P., and Ming, D. (2021). Review of brain encoding and decoding mechanisms for EEG-based brain\u2013computer interface. Cogn. Neurodyn., 1\u201316.","DOI":"10.1007\/s11571-021-09676-z"},{"key":"ref_41","unstructured":"Frequency Dictionary (2021, March 13). Word Frequency Data. Available online: https:\/\/www.wordfrequency.info\/."},{"key":"ref_42","doi-asserted-by":"crossref","first-page":"617","DOI":"10.1111\/j.1469-8986.2008.00783.x","article-title":"An auditory oddball (P300) spelling system for brain-computer interfaces","volume":"46","author":"Furdea","year":"2009","journal-title":"Psychophysiology"},{"key":"ref_43","doi-asserted-by":"crossref","first-page":"1109","DOI":"10.1016\/j.clinph.2010.01.030","article-title":"A novel P300-based brain\u2013computer interface stimulus presentation paradigm: Moving beyond rows and columns","volume":"121","author":"Townsend","year":"2010","journal-title":"Clin. Neurophysiol."},{"key":"ref_44","doi-asserted-by":"crossref","first-page":"326","DOI":"10.1109\/86.712231","article-title":"EEG-based communication: Improved accuracy by response verification","volume":"6","author":"Wolpaw","year":"1998","journal-title":"IEEE Trans. Rehabil. Eng."},{"key":"ref_45","doi-asserted-by":"crossref","first-page":"026024","DOI":"10.1088\/1741-2560\/13\/2\/026024","article-title":"Pushing the P300-based brain\u2013computer interface beyond 100 bpm: Extending performance guided constraints into the temporal domain","volume":"13","author":"Townsend","year":"2016","journal-title":"J. Neural Eng."},{"key":"ref_46","doi-asserted-by":"crossref","first-page":"2245","DOI":"10.1007\/s11517-017-1671-5","article-title":"Performance improvement of ERP-based brain\u2013computer interface via varied geometric patterns","volume":"55","author":"Ma","year":"2017","journal-title":"Med. Biol. Eng. Comput."},{"key":"ref_47","doi-asserted-by":"crossref","first-page":"30","DOI":"10.1080\/2326263X.2018.1433776","article-title":"P300 brain-computer interface: Comparing faces to size matched non-face stimuli","volume":"5","author":"Sellers","year":"2018","journal-title":"Brain Comp. Interfaces"},{"key":"ref_48","doi-asserted-by":"crossref","first-page":"69","DOI":"10.1080\/10447318.2011.535754","article-title":"Predictive Spelling with a P300-Based Brain\u2013Computer Interface: Increasing the Rate of Communication","volume":"27","author":"Ryan","year":"2010","journal-title":"Int. J. Hum. Comput. Interact."},{"key":"ref_49","unstructured":"Brooke, J. (1996). SUS: A \u2018Quick and Dirty\u2019 Usability Scale. Usability Evaluation in Industry, Taylore & Francis."},{"key":"ref_50","doi-asserted-by":"crossref","first-page":"904","DOI":"10.1177\/154193120605000909","article-title":"Nasa-Task Load Index (NASA-TLX); 20 Years Later","volume":"50","author":"Hart","year":"2006","journal-title":"Proc. Hum. Factors Ergon. Soc. Annu. Meet."},{"key":"ref_51","doi-asserted-by":"crossref","first-page":"574","DOI":"10.1080\/10447310802205776","article-title":"An Empirical Evaluation of the System Usability Scale","volume":"24","author":"Bangor","year":"2008","journal-title":"Int. J. Hum. Comput. Interact."},{"key":"ref_52","doi-asserted-by":"crossref","first-page":"139","DOI":"10.1016\/S0166-4115(08)62386-9","article-title":"Development of NASA-TLX (Task Load Index): Results of Empirical and Theoretical Research","volume":"52","author":"Hart","year":"1988","journal-title":"Adv. Psychol."},{"key":"ref_53","doi-asserted-by":"crossref","first-page":"869","DOI":"10.1007\/s11517-021-02340-y","article-title":"Different effects of using pictures as stimuli in a P300 brain-computer interface under rapid serial visual presentation or row-column paradigm","volume":"59","year":"2021","journal-title":"Med. Biol. Eng. Comput."},{"key":"ref_54","doi-asserted-by":"crossref","first-page":"57","DOI":"10.1080\/2326263X.2020.1848134","article-title":"TeleBCI: Remote user training, monitoring, and communication with an evoked-potential brain-computer interface","volume":"7","author":"Geronimo","year":"2020","journal-title":"Brain Comput. Interfaces"},{"key":"ref_55","doi-asserted-by":"crossref","first-page":"118","DOI":"10.1016\/j.biopsycho.2014.07.014","article-title":"Effects of mental workload and fatigue on the P300, alpha and theta band power during operation of an ERP (P300) brain\u2013computer interface","volume":"102","author":"Wriessnegger","year":"2014","journal-title":"Biol. Psychol."},{"key":"ref_56","doi-asserted-by":"crossref","first-page":"385","DOI":"10.1016\/0191-8869(86)90014-0","article-title":"Response bias, social desirability and dissimulation","volume":"7","author":"Furnham","year":"1986","journal-title":"Personal. Individ. Differ."},{"key":"ref_57","doi-asserted-by":"crossref","first-page":"163","DOI":"10.1007\/978-981-15-7130-5_12","article-title":"Artificial Intelligence and Virtual Assistant\u2014Working Model","volume":"Volume 140","author":"Arora","year":"2021","journal-title":"Lecture Notes in Networks and Systems"},{"key":"ref_58","doi-asserted-by":"crossref","first-page":"104","DOI":"10.1007\/978-3-030-23987-9_10","article-title":"On Reproducibility of Deep Convolutional Neural Networks Approaches","volume":"Volume 11455","author":"Piantadosi","year":"2019","journal-title":"Lecture Notes in Computer Science"},{"key":"ref_59","doi-asserted-by":"crossref","unstructured":"Michaely, A.H., Zhang, X., Simko, G., Parada, C., and Aleksic, P. (2017, January 16\u201320). Keyword spotting for Google assistant using contextual speech recognition. Proceedings of the 2017 IEEE Automatic Speech Recognition and Understanding Workshop (ASRU), Okinawa, Japan.","DOI":"10.1109\/ASRU.2017.8268946"},{"key":"ref_60","doi-asserted-by":"crossref","unstructured":"Aleksic, P., Ghodsi, M., Michaely, A., Allauzen, C., Hall, K., Roark, B., Rybach, D., and Moreno, P. (2015, January 6\u201310). Bringing contextual information to google speech recognition. Proceedings of the Annual Conference of the International Speech Communication Association, INTERSPEECH, Dresden, Germany.","DOI":"10.21437\/Interspeech.2015-177"},{"key":"ref_61","doi-asserted-by":"crossref","first-page":"1909","DOI":"10.1016\/j.clinph.2008.03.034","article-title":"A P300-based brain\u2013computer interface for people with amyotrophic lateral sclerosis","volume":"119","author":"Nijboer","year":"2008","journal-title":"Clin. Neurophysiol."},{"key":"ref_62","doi-asserted-by":"crossref","first-page":"207","DOI":"10.3109\/21678421.2013.865750","article-title":"Brain-computer interface (BCI) evaluation in people with amyotrophic lateral sclerosis","volume":"15","author":"McCane","year":"2014","journal-title":"Amyotroph. Lateral Scler. Front. Degener."},{"key":"ref_63","doi-asserted-by":"crossref","first-page":"583358","DOI":"10.3389\/fnhum.2020.583358","article-title":"P300-Based Brain-Computer Interface Speller: Usability Evaluation of Three Speller Sizes by Severely Motor-Disabled Patients","volume":"14","year":"2020","journal-title":"Front. Hum. Neurosci."},{"key":"ref_64","doi-asserted-by":"crossref","first-page":"13","DOI":"10.1016\/S0022-510X(99)00210-5","article-title":"The ALSFRS-R: A revised ALS functional rating scale that incorporates assessments of respiratory function","volume":"169","author":"Cedarbaum","year":"1999","journal-title":"J. Neurol. 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