AUTHOR=Bickenbach Jerome TITLE=Human Functioning: Developments and Grand Challenges JOURNAL=Frontiers in Rehabilitation Sciences VOLUME=1 YEAR=2021 URL=https://www.frontiersin.org/journals/rehabilitation-sciences/articles/10.3389/fresc.2020.617782 DOI=10.3389/fresc.2020.617782 ISSN=2673-6861