One year follow-up of physical performance and quality of life in patients surviving COVID-19: a prospective cohort study - Martina Betschart; Spencer Rezek; Ines Unger; Natalie Ott; Swantje Beyer; André Böni; David Gisi; Harriet Shannon; Martijn A. Spruit; Cornel Sieber (Swiss Medical Weekly, 2021)