Factors Associated With Using the COVID-19 Mobile Contact-Tracing App Among Individuals Diagnosed With SARS-CoV-2 in Amsterdam, the Netherlands: Observational Study by Feiko Ritsema, Jizzo R Bosdriesz, Tjalling Leenstra, Mariska W F Petrignani, Liza Coyer, Anja J M Schreijer, Yvonne T H P van Duijnhoven, Janneke H H M van de Wijgert, Maarten F Schim van der Loeff, Amy Matser

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