Reasons for Discontinuing Active Participation on the Internet Forum Tinnitus Talk: Mixed Methods Citizen Science Study - Budimir, S.; Schlee, Winfried; Kuska, M.; Spiliopoulou, M.; Pryss, R.; Andersson, G.; Goedhart, H.; Harrison, S.; Vesala, M.; Hegde, G.; Langguth, B.; Pieh, C.; et al. (My University, 2021)