Impact of SARS-CoV-2 on incidence, treatment and outcome of very preterm born infants in Switzerland: a retrospective, population-based cohort study - Mark Adams; Sven M. Schulzke; Bjarte Rogdo; Philipp Meyer; Jane McDougall; Martin Stocker; Juliane Schneider; Thomas Riedel; Riccardo Pfister; Dirk Bassler (Swiss Medical Weekly, 2022)