Long-term Consequences of COVID-19 and the Pandemic: Protocol for a Web-Based, Longitudinal Observational Study (DEFEAT). - Mikuteit M; Heinemann S; Roder S; Niewolik J; Schröder D; Vahldiek K; Klawitter S; Cossmann A; Bergemann T; Degen C; Klawonn F; Behrens GMN; et al. (JMIR research protocols, 2022)