- Tackling Biases and Bubbles in Participation: COVID-19 Survey 2020(2023-08-22) Kantola, Anu; Saikkonen, Paula; Vesa, Juho; Wass, Hanna; University of Helsinki - Kantola, Anu; Finnish Institute for Health and Welfare - Saikkonen, Paula; University of Helsinki - Vesa, Juho; University of Helsinki - Wass, Hanna