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Publications were identified through PubMed, supplemented by reference list screening and author contact where necessary.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Participants<\/jats:title>\n                    <jats:p>We identified 170 relevant publications related to the development, validation and implementation, covering 34 CS across diverse health conditions. Eligible publications comprised preparatory studies (eg, systematic reviews, patient perspective studies, expert surveys), protocol\/discussion papers, consensus conference reports, validation and implementation studies.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results<\/jats:title>\n                    <jats:p>Most publications originated from Europe. The comprehensive CS averaged 97 ICF categories (SD 29) and the brief CS 26 (SD 12). In 38% of the studies, the focus was only on validity research. Variations were observed in patient and expert involvement during development. Considerable variation was observed in stakeholder involvement, geographical representation, consensus procedures and validation approaches across developmental phases.<\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusion<\/jats:title>\n                    <jats:p>\n                      This review demonstrates substantial methodological diversity in ICF CS development across the different phases. While the developmental framework proposed by Selb\n                      <jats:italic>et al<\/jats:italic>\n                      was generally reflected across studies, considerable variation existed in how developmental phases were operationalised. Future ICF CS developments may benefit from stakeholder involvement, more balanced geographical representation, and continued attention to validation and implementation activities.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1136\/bmjopen-2026-123955","type":"journal-article","created":{"date-parts":[[2026,10,5]],"date-time":"2026-10-05T13:35:39Z","timestamp":1791207339000},"page":"e123955","update-policy":"https:\/\/doi.org\/10.1136\/crossmarkpolicy","source":"Crossref","is-referenced-by-count":0,"title":["Methodologies used in the development of the international classification of functioning, disability and health core sets: a systematic scoping review"],"prefix":"10.1136","volume":"16","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8389-9311","authenticated-orcid":false,"given":"Lorenzo","family":"Billiet","sequence":"first","affiliation":[{"name":"Amsterdam UMC Locatie AMC, Amsterdam, The Netherlands"},{"name":"Amsterdam Public Health Research Institute, Amsterdam, The Netherlands"},{"name":"Faculty of Medicine and Health Sciences, Ghent University, Ghent, Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6856-5305","authenticated-orcid":false,"given":"Stijn","family":"De Baets","sequence":"additional","affiliation":[{"name":"Department of Rehabilitation Sciences, Ghent University, Gavere - asper, Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6982-1075","authenticated-orcid":false,"given":"Dominique","family":"Van de Velde","sequence":"additional","affiliation":[{"name":"Ghent University Department of Rehabilitation Sciences, Ghent, Flanders, Belgium"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Ruth M A","family":"van Nispen","sequence":"additional","affiliation":[{"name":"Ophthalmology, Amsterdam UMC Locatie VUmc, Amsterdam, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Hilde P A","family":"van der Aa","sequence":"additional","affiliation":[{"name":"Ophthalmology, Amsterdam UMC Locatie VUmc, Amsterdam, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"239","published-online":{"date-parts":[[2026,10,5]]},"reference":[{"key":"2026100506352511000_16.10.e123955.1","unstructured":"WHO . 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