{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,2,21]],"date-time":"2025-02-21T12:22:47Z","timestamp":1740140567408,"version":"3.37.3"},"reference-count":42,"publisher":"Springer Science and Business Media LLC","issue":"1","license":[{"start":{"date-parts":[[2021,10,2]],"date-time":"2021-10-02T00:00:00Z","timestamp":1633132800000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"},{"start":{"date-parts":[[2021,10,2]],"date-time":"2021-10-02T00:00:00Z","timestamp":1633132800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0"}],"funder":[{"DOI":"10.13039\/501100007129","name":"shandong provincial natural science foundation","doi-asserted-by":"crossref","award":["ZR2020QF002"],"award-info":[{"award-number":["ZR2020QF002"]}],"id":[{"id":"10.13039\/501100007129","id-type":"DOI","asserted-by":"crossref"}]}],"content-domain":{"domain":["link.springer.com"],"crossmark-restriction":false},"short-container-title":["J Wireless Com Network"],"published-print":{"date-parts":[[2021,12]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:p>In this paper, we consider a wireless powered cognitive relaying system with a secondary relay (SR) capable of harvesting wireless energy. Along with an access point (AP) continuously transmitting the primary data to a primary user (PU), a secondary source (SS) can transmit the secondary data to a secondary destination (SD) with the help of SR using the decode-and-forward (DF) protocol. SR can harvest energy from both SS and AP in both time and power domains using time-splitting and power-splitting techniques. The interference from primary data transmissions can help boost the amount of harvested energy at SR. The transmit power of SS is regulated by the interference threshold at PU and the allowable peak power. Despite the above two constraints, the transmit power of SR is further constrained by the amount of harvested energy. Once SR successfully decodes the data from SS, it will forward the data to SD using a constrained power. We analyze the approximate outage probabilities for both primary and secondary systems. Simulation results are provided to verify the effectiveness of our theoretical analysis and reveal the impacts of various parameters to the outage performance.<\/jats:p>","DOI":"10.1186\/s13638-021-02058-3","type":"journal-article","created":{"date-parts":[[2021,10,4]],"date-time":"2021-10-04T14:45:42Z","timestamp":1633358742000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Two-hop cognitive DF relaying with wireless power transfer in time and power domains"],"prefix":"10.1186","volume":"2021","author":[{"given":"Lina","family":"Zheng","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9925-303X","authenticated-orcid":false,"given":"Chao","family":"Zhai","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2021,10,2]]},"reference":[{"issue":"5","key":"2058_CR1","doi-asserted-by":"publisher","first-page":"894","DOI":"10.1109\/JPROC.2009.2015717","volume":"97","author":"A Goldsmith","year":"2009","unstructured":"A. Goldsmith, S.A. Jafa, I. Maric, S. Srinivasa, Breaking spectrum gridlock with cognitive radios: an information theoretic perspective. Proc. IEEE 97(5), 894\u2013914 (2009)","journal-title":"Proc. IEEE"},{"issue":"1","key":"2058_CR2","doi-asserted-by":"publisher","first-page":"203","DOI":"10.1109\/JSAC.2008.080118","volume":"26","author":"O Simeone","year":"2008","unstructured":"O. Simeone, I. Stanojev, S. Savazzi, Y. Bar-Ness, U. Spagnolini, R. Pickholtz, Spectrum leasing to cooperating secondary ad hoc networks. IEEE J. Sel. Areas Commun. 26(1), 203\u2013213 (2008)","journal-title":"IEEE J. Sel. Areas Commun."},{"issue":"4","key":"2058_CR3","doi-asserted-by":"publisher","first-page":"1796","DOI":"10.1109\/TSP.2011.2181841","volume":"60","author":"W Su","year":"2012","unstructured":"W. Su, J.D. Matyjas, S. Batalama, Active cooperation between primary users and cognitive radio users in heterogeneous ad-hoc networks. IEEE Trans. Signal Process. 60(4), 1796\u20131805 (2012)","journal-title":"IEEE Trans. Signal Process."},{"issue":"6","key":"2058_CR4","doi-asserted-by":"publisher","first-page":"2260","DOI":"10.1109\/TCOMM.2013.041113.120768","volume":"61","author":"C Zhai","year":"2013","unstructured":"C. Zhai, W. Zhang, P.C. Ching, Cooperative spectrum sharing based on two-path successive relaying. IEEE Trans. Commun. 61(6), 2260\u20132270 (2013)","journal-title":"IEEE Trans. Commun."},{"issue":"12","key":"2058_CR5","doi-asserted-by":"publisher","first-page":"5306","DOI":"10.1109\/T-WC.2008.070890","volume":"7","author":"LB Le","year":"2008","unstructured":"L.B. Le, E. Hossain, Resource allocation for spectrum underlay in cognitive radio networks. IEEE Trans. Wirel. Commun. 7(12), 5306\u20135315 (2008)","journal-title":"IEEE Trans. Wirel. Commun."},{"issue":"1","key":"2058_CR6","doi-asserted-by":"publisher","first-page":"207","DOI":"10.1109\/TCOMM.2020.3025555","volume":"69","author":"Y Xu","year":"2021","unstructured":"Y. Xu, B. Li, N. Zhao, Y. Chen, G. Wang, Z. Ding, X. Wang, Coordinated direct and relay transmission with NOMA and network coding in Nakagami-m fading channels. IEEE Trans. Commun. 69(1), 207\u2013222 (2021)","journal-title":"IEEE Trans. Commun."},{"issue":"2","key":"2058_CR7","doi-asserted-by":"publisher","first-page":"1249","DOI":"10.1109\/COMST.2016.2631079","volume":"19","author":"ME Tanab","year":"2017","unstructured":"M.E. Tanab, W. Hamouda, Resource allocation for underlay cognitive radio networks: a survey. IEEE Commun. Surv. Tutor. 19(2), 1249\u20131276 (2017)","journal-title":"IEEE Commun. Surv. Tutor."},{"issue":"12","key":"2058_CR8","doi-asserted-by":"publisher","first-page":"3062","DOI":"10.1109\/TIT.2004.838089","volume":"50","author":"JN Laneman","year":"2004","unstructured":"J.N. Laneman, D.N.C. Tse, G.W. Wornell, Cooperative diversity in wireless networks: efficient protocols and outage behavior. IEEE Trans. Inf. Theory 50(12), 3062\u20133080 (2004)","journal-title":"IEEE Trans. Inf. Theory"},{"issue":"4","key":"2058_CR9","doi-asserted-by":"publisher","first-page":"334","DOI":"10.1109\/LCOM.2007.348292","volume":"11","author":"S Ikki","year":"2007","unstructured":"S. Ikki, M. Ahmed, Performance analysis of cooperative diversity wireless networks over Nakagami-m fading channel. IEEE Commun. Lett. 11(4), 334\u2013336 (2007)","journal-title":"IEEE Commun. Lett."},{"issue":"6","key":"2058_CR10","doi-asserted-by":"publisher","first-page":"2656","DOI":"10.1109\/TVT.2011.2136391","volume":"60","author":"V Asghari","year":"2011","unstructured":"V. Asghari, S. A\u00efssa, End-to-end performance of cooperative relaying in spectrum-sharing systems with quality of service requirements. IEEE Trans. Veh. Technol. 60(6), 2656\u20132668 (2011)","journal-title":"IEEE Trans. Veh. Technol."},{"issue":"11","key":"2058_CR11","doi-asserted-by":"publisher","first-page":"741","DOI":"10.1109\/LSP.2012.2217327","volume":"19","author":"TQ Duong","year":"2012","unstructured":"T.Q. Duong, P.L. Yeoh, V.N.Q. Bao, M. Elkashlan, N. Yang, Cognitive relay networks with multiple primary transceivers under spectrum-sharing. IEEE Signal Process. Lett. 19(11), 741\u2013744 (2012)","journal-title":"IEEE Signal Process. Lett."},{"issue":"1","key":"2058_CR12","doi-asserted-by":"publisher","first-page":"209","DOI":"10.1109\/TCOMM.2011.101411.100677","volume":"60","author":"J Hong","year":"2012","unstructured":"J. Hong, B. Hong, T. Ban, W. Choi, On the cooperative diversity gain in underlay cognitive radio systems. IEEE Trans. Commun. 60(1), 209\u2013219 (2012)","journal-title":"IEEE Trans. Commun."},{"issue":"11","key":"2058_CR13","doi-asserted-by":"publisher","first-page":"3252","DOI":"10.1109\/TCOMM.2012.082712.120108","volume":"60","author":"M Xia","year":"2012","unstructured":"M. Xia, S. A\u00efssa, Cooperative AF relaying in spectrum-sharing systems: outage probability analysis under co-channel interferences and relay selection. IEEE Trans. Commun. 60(11), 3252\u20133262 (2012)","journal-title":"IEEE Trans. Commun."},{"key":"2058_CR14","first-page":"1","volume":"234","author":"C Zhai","year":"2018","unstructured":"C. Zhai, L. Zheng, W. Guo, Cognitive decode-and-forward relaying with successive interference cancellation. EURASIP J. Wirel. Commun. Netw. 234, 1\u201317 (2018)","journal-title":"EURASIP J. Wirel. Commun. Netw."},{"key":"2058_CR15","doi-asserted-by":"crossref","unstructured":"M. Elsaadany, W. Hamouda, Enhancing the performance of amplify-and-forward cognitive relay networks: a multiple-relay scenario, in Proceedings of the IEEE Global Communications Conference (GLOBECOM), 6\u201310 December 2015 (San Diego, USA, 2015)","DOI":"10.1109\/GLOCOM.2015.7417509"},{"key":"2058_CR16","doi-asserted-by":"crossref","unstructured":"S. Majhi, S.S. Kalamkar, A. Banerjee, Secondary outage analysis of amplify-and-forward cognitive relays with direct link and primary interference, in Proceedings of the Twenty First National Conference on Communications (NCC), 27 Feburary\u20131 March 2015 (Mumbai, India, 2015)","DOI":"10.1109\/NCC.2015.7084907"},{"key":"2058_CR17","doi-asserted-by":"crossref","unstructured":"L. R. Varshney, Transporting information and energy simultaneously, in Proceedings of the IEEE International Symposium on Information Theory (ISIT), 6\u201311 July 2008 (Toronto, Canada, 2008), pp. 1612\u20131616","DOI":"10.1109\/ISIT.2008.4595260"},{"issue":"4","key":"2058_CR18","doi-asserted-by":"publisher","first-page":"94","DOI":"10.1109\/MCOM.2015.7081081","volume":"53","author":"L Mohjazi","year":"2015","unstructured":"L. Mohjazi, M. Dianati, G.K. Karagiannidis, S. Muhaidat, M. Al-Qutayri, RF-powered cognitive radio networks: technical challenges and limitations. IEEE Commun. Mag. 53(4), 94\u2013100 (2015)","journal-title":"IEEE Commun. Mag."},{"issue":"11","key":"2058_CR19","doi-asserted-by":"publisher","first-page":"4754","DOI":"10.1109\/TCOMM.2013.13.120855","volume":"61","author":"X Zhou","year":"2013","unstructured":"X. Zhou, R. Zhang, C.K. Ho, Wireless information and power transfer: architecture design and rate-energy tradeoff. IEEE Trans. Commun. 61(11), 4754\u20134767 (2013)","journal-title":"IEEE Trans. Commun."},{"issue":"7","key":"2058_CR20","doi-asserted-by":"publisher","first-page":"3622","DOI":"10.1109\/TWC.2013.062413.122042","volume":"12","author":"AA Nasir","year":"2013","unstructured":"A.A. Nasir, X. Zhou, S. Durrani, R.A. Kennedy, Relaying protocols for wireless energy harvesting and information processing. IEEE Trans. Wirel. Commun. 12(7), 3622\u20133636 (2013)","journal-title":"IEEE Trans. Wirel. Commun."},{"issue":"5","key":"2058_CR21","doi-asserted-by":"publisher","first-page":"1607","DOI":"10.1109\/TCOMM.2015.2415480","volume":"63","author":"AA Nasir","year":"2015","unstructured":"A.A. Nasir, X. Zhou, S. Durrani, R.A. Kennedy, Wireless-powered relays in cooperative communications: time-switching relaying protocols and throughput analysis. IEEE Trans. Commun. 63(5), 1607\u20131622 (2015)","journal-title":"IEEE Trans. Commun."},{"issue":"10","key":"2058_CR22","doi-asserted-by":"publisher","first-page":"10022","DOI":"10.1109\/TVT.2018.2853614","volume":"67","author":"S Modem","year":"2018","unstructured":"S. Modem, S. Prakriya, Performance of EH protocols in two-hop networks with a battery-assisted EH relay. IEEE Trans. Veh. Technol. 67(10), 10022\u201310026 (2018)","journal-title":"IEEE Trans. Veh. Technol."},{"issue":"8","key":"2058_CR23","doi-asserted-by":"publisher","first-page":"5789","DOI":"10.1109\/TWC.2016.2569097","volume":"15","author":"S Atapattu","year":"2016","unstructured":"S. Atapattu, J. Evans, Optimal energy harvesting protocols for wireless relay networks. IEEE Trans. Wirel. Commun. 15(8), 5789\u20135803 (2016)","journal-title":"IEEE Trans. Wirel. Commun."},{"issue":"3","key":"2058_CR24","doi-asserted-by":"publisher","first-page":"523","DOI":"10.1007\/s11235-017-0399-8","volume":"68","author":"L Zheng","year":"2018","unstructured":"L. Zheng, C. Zhai, J. Liu, Alternate energy harvesting and information relaying in cooperative AF networks. Telecommun. Syst. 68(3), 523\u2013533 (2018)","journal-title":"Telecommun. Syst."},{"issue":"4","key":"2058_CR25","doi-asserted-by":"publisher","first-page":"140304:1","DOI":"10.1007\/s11432-020-3060-4","volume":"64","author":"W Lu","year":"2021","unstructured":"W. Lu, P. Si, F. LU, B. Li, Z. Liu, S. Hu, Y. Gong, Resource and trajectory optimization in UAV-powered wireless communication system. Sci. China Inf. Sci. 64(4), 140304:1-140304:14 (2021)","journal-title":"Sci. China Inf. Sci."},{"key":"2058_CR26","doi-asserted-by":"publisher","first-page":"199","DOI":"10.1016\/j.comnet.2019.02.009","volume":"152","author":"C Zhai","year":"2019","unstructured":"C. Zhai, Z. Yu, X. Wang, High-efficient cooperative relaying with wireless powered source and relay. Comput. Netw. 152, 199\u2013209 (2019)","journal-title":"Comput. Netw."},{"issue":"5","key":"2058_CR27","doi-asserted-by":"publisher","first-page":"1875","DOI":"10.1109\/TCOMM.2016.2542822","volume":"64","author":"C Zhai","year":"2016","unstructured":"C. Zhai, J. Liu, L. Zheng, Relay based spectrum sharing with secondary users powered by wireless energy harvesting. IEEE Trans. Commun. 64(5), 1875\u20131887 (2016)","journal-title":"IEEE Trans. Commun."},{"key":"2058_CR28","doi-asserted-by":"crossref","unstructured":"V. Rakovic, D. Denkovski, Z. Hadzi-Velkov, L. Gavrilovska, Optimal time sharing in underlay cognitive radio systems with RF energy harvesting, in Proceedings IEEE International Conference on Communications (ICC) (London, UK, 2015), pp. 7689\u20137694","DOI":"10.1109\/ICC.2015.7249556"},{"key":"2058_CR29","doi-asserted-by":"publisher","DOI":"10.1109\/JIOT.2020.3026730","author":"W Lu","year":"2020","unstructured":"W. Lu, P. Si, G. Huang, H. Han, L. Qian, N. Zhao, Y. Gong, SWIPT cooperative spectrum sharing for 6G-enabled cognitive IoT network. IEEE Internet Things J. (2020). https:\/\/doi.org\/10.1109\/JIOT.2020.3026730","journal-title":"IEEE Internet Things J."},{"issue":"5","key":"2058_CR30","doi-asserted-by":"publisher","first-page":"3828","DOI":"10.1109\/TVT.2015.2443875","volume":"65","author":"Z Yang","year":"2016","unstructured":"Z. Yang, Z. Ding, P. Fan, G.K. Karagiannidis, Outage performance of cognitive relay networks with wireless information and power transfer. IEEE Trans. Veh. Technol. 65(5), 3828\u20133833 (2016)","journal-title":"IEEE Trans. Veh. Technol."},{"issue":"4","key":"2058_CR31","doi-asserted-by":"publisher","first-page":"2562","DOI":"10.1109\/TWC.2015.2504581","volume":"15","author":"Z Wang","year":"2016","unstructured":"Z. Wang, Z. Chen, B. Xia, L. Ling, J. Zhou, Cognitive relay networks with energy harvesting and information transfer: desing, analysis, and optimization. IEEE Trans. Wirel. Commun. 15(4), 2562\u20132576 (2016)","journal-title":"IEEE Trans. Wirel. Commun."},{"issue":"11","key":"2058_CR32","doi-asserted-by":"publisher","first-page":"6425","DOI":"10.1109\/TWC.2015.2453418","volume":"14","author":"Yanju Gu","year":"2015","unstructured":"Yanju Gu, Sonia A\u00efssa, RF-based energy harvesting in decode-and-forward relaying systems: ergodic and outage capacities. IEEE Trans. Wirel. Commun. 14(11), 6425\u20136434 (2015)","journal-title":"IEEE Trans. Wirel. Commun."},{"issue":"4","key":"2058_CR33","doi-asserted-by":"publisher","first-page":"2498","DOI":"10.1109\/TWC.2015.2504520","volume":"15","author":"Y Liu","year":"2016","unstructured":"Y. Liu, S.A. Mousavifar, Y. Deng, C. Leung, M. Elkashlan, Wireless energy harvesting in a cognitive relay network. IEEE Trans. Wirel. Commun. 15(4), 2498\u20132508 (2016)","journal-title":"IEEE Trans. Wirel. Commun."},{"issue":"3","key":"2058_CR34","doi-asserted-by":"publisher","first-page":"313","DOI":"10.1109\/TCCN.2017.2730869","volume":"3","author":"SS Kalamkar","year":"2017","unstructured":"S.S. Kalamkar, A. Banerjee, Interference-aided energy harvesting: cognitive relaying with multiple primary transceivers. IEEE Trans. Cogn. Commun. Netw. 3(3), 313\u2013327 (2017)","journal-title":"IEEE Trans. Cogn. Commun. Netw."},{"issue":"2","key":"2058_CR35","doi-asserted-by":"publisher","first-page":"358","DOI":"10.1109\/TCCN.2019.2908900","volume":"5","author":"J Ye","year":"2019","unstructured":"J. Ye, Z. Liu, H. Zhao, G. Pan, Q. Ni, M.-S. Alouini, Relay selections for cooperative underlay CR systems with energy harvesting. IEEE Trans. Cogn. Commun. Netw. 5(2), 358\u2013369 (2019)","journal-title":"IEEE Trans. Cogn. Commun. Netw."},{"issue":"1","key":"2058_CR36","doi-asserted-by":"publisher","first-page":"629","DOI":"10.1109\/JSYST.2020.2991235","volume":"15","author":"C Zhai","year":"2021","unstructured":"C. Zhai, Y. Li, C. Li, J. Liu, Cognitive relaying with wireless energy harvesting and accumulation. IEEE Syst. J. 15(1), 629\u2013640 (2021)","journal-title":"IEEE Syst. J."},{"issue":"4","key":"2058_CR37","doi-asserted-by":"publisher","first-page":"2691","DOI":"10.1109\/JIOT.2018.2800716","volume":"5","author":"Z Yan","year":"2018","unstructured":"Z. Yan, S. Chen, X. Zhang, H.-L. Liu, Outage performance analysis of wireless energy harvesting relay-assisted random underlay cognitive networks. IEEE Internet Things J. 5(4), 2691\u20132699 (2018)","journal-title":"IEEE Internet Things J."},{"issue":"1","key":"2058_CR38","doi-asserted-by":"publisher","first-page":"108232","DOI":"10.1109\/ACCESS.2019.2932578","volume":"7","author":"L Zheng","year":"2019","unstructured":"L. Zheng, C. Zhai, Amplify-and-forward relaying based spectrum sharing in both time and spectrum domains with wireless powered primary user. IEEE Access 7(1), 108232\u2013108247 (2019)","journal-title":"IEEE Access"},{"issue":"3","key":"2058_CR39","doi-asserted-by":"publisher","first-page":"1872","DOI":"10.1109\/TCOMM.2018.2886002","volume":"67","author":"C Zhai","year":"2019","unstructured":"C. Zhai, H. Chen, Z. Yu, J. Liu, Cognitive relaying with wireless powered primary user. IEEE Trans. Commun. 67(3), 1872\u20131884 (2019)","journal-title":"IEEE Trans. Commun."},{"issue":"7","key":"2058_CR40","doi-asserted-by":"publisher","first-page":"1700","DOI":"10.1109\/TSP.2015.2396009","volume":"63","author":"H Chen","year":"2015","unstructured":"H. Chen, Y. Li, J.L. Rebelatto, B.F. Uchoa-Filho, B. Vucetic, Harvest-then-cooperate: wireless-powered cooperative communications. IEEE Trans. Signal Process. 63(7), 1700\u20131711 (2015)","journal-title":"IEEE Trans. Signal Process."},{"issue":"3","key":"2058_CR41","doi-asserted-by":"publisher","first-page":"443","DOI":"10.1109\/SURV.2011.060710.00094","volume":"13","author":"S Sudevalayam","year":"2011","unstructured":"S. Sudevalayam, P. Kulkarni, Energy harvesting sensor nodes: survey and implications. IEEE Commun. Surv. Tutor. 13(3), 443\u2013461 (2011)","journal-title":"IEEE Commun. Surv. Tutor."},{"issue":"1","key":"2058_CR42","doi-asserted-by":"publisher","first-page":"221","DOI":"10.1109\/TWC.2016.2621766","volume":"16","author":"KW Choi","year":"2017","unstructured":"K.W. Choi, L. Ginting, P.A. Rosyady, A.A. Aziz, D.I. Kim, Wireless-powered sensor networks: how to realize. IEEE Trans. Wirel. Commun. 16(1), 221\u2013234 (2017)","journal-title":"IEEE Trans. Wirel. Commun."}],"container-title":["EURASIP Journal on Wireless Communications and Networking"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/link.springer.com\/content\/pdf\/10.1186\/s13638-021-02058-3.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/link.springer.com\/article\/10.1186\/s13638-021-02058-3\/fulltext.html","content-type":"text\/html","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/link.springer.com\/content\/pdf\/10.1186\/s13638-021-02058-3.pdf","content-type":"application\/pdf","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2021,10,4]],"date-time":"2021-10-04T15:16:29Z","timestamp":1633360589000},"score":1,"resource":{"primary":{"URL":"https:\/\/jwcn-eurasipjournals.springeropen.com\/articles\/10.1186\/s13638-021-02058-3"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,10,2]]},"references-count":42,"journal-issue":{"issue":"1","published-print":{"date-parts":[[2021,12]]}},"alternative-id":["2058"],"URL":"https:\/\/doi.org\/10.1186\/s13638-021-02058-3","relation":{},"ISSN":["1687-1499"],"issn-type":[{"type":"electronic","value":"1687-1499"}],"subject":[],"published":{"date-parts":[[2021,10,2]]},"assertion":[{"value":"22 July 2021","order":1,"name":"received","label":"Received","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"23 September 2021","order":2,"name":"accepted","label":"Accepted","group":{"name":"ArticleHistory","label":"Article History"}},{"value":"2 October 2021","order":3,"name":"first_online","label":"First Online","group":{"name":"ArticleHistory","label":"Article History"}},{"order":1,"name":"Ethics","group":{"name":"EthicsHeading","label":"Declarations"}},{"value":"The authors declare that they have no competing interests.","order":2,"name":"Ethics","group":{"name":"EthicsHeading","label":"Competing interests"}}],"article-number":"182"}}