Walrave, MichelMichelWalraveWaeterloos, CatoCatoWaeterloosPonnet, KoenKoenPonnet2023-01-122023-01-1220222369-2960WOS:000749005400013https://imec-publications.be/handle/20.500.12860/40968Reasons for Nonuse, Discontinuation of Use, and Acceptance of Additional Functionalities of a COVID-19 Contact Tracing App: Cross-sectional Survey StudyJournal article10.2196/22113WOS:000749005400013MEDLINE:34794117