Factors Associated With Using the COVID-19 Mobile Contact-Tracing App Among Individuals Diagnosed With SARS-CoV-2 in Amsterdam, the Netherlands: Observational Study

Feiko Ritsema   ¹ , MSc ;   Jizzo R Bosdriesz   ^{1, 2} , PhD ;   Tjalling Leenstra   ¹ , MD, PhD ;   Mariska W F Petrignani   ¹ , MD ;   Liza Coyer   ^{1, 2} , MSc ;   Anja J M Schreijer   ¹ , MD, PhD ;   Yvonne T H P van Duijnhoven   ¹ , PhD ;   Janneke H H M van de Wijgert   ³ , MD, PhD ;   Maarten F Schim van der Loeff   ^{1, 2} , MD, PhD ;   Amy Matser   ^{1, 2} , PhD

¹ Department of Infectious Diseases, GGD Amsterdam, Amsterdam, Netherlands

² Department of Internal Medicine, Amsterdam Institute for Infection and Immunity, Amsterdam UMC, Academic Medical Center, Amsterdam, Netherlands

³ Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht University, Utrecht, Netherlands