Anja Renner

Methods The national, multicentre, observational Swiss COVID-19 lung study is a prospective cohort study that includes adults who survived acute COVID-19 and presented with residual symptoms for follow-up assessments 3, 6 and 12 months after first COVID-19 symptoms. For practical reasons, it was not possible to adhere precisely to the follow-up schedule, and participants presenting for their first follow-up visit later than 3 months were still allowed to participate.