From disgusting and complicated to simple and brilliant: Implementation perspectives and lessons learned from users and rejectors of mail-in SARS-CoV-2 gargle tests. - Röhr F; Uellner F; Deckert A; Anders S; Burk R; Knop M; Brugnara L; Bärnighausen T; Jahn A; McMahon S; Souares A (Frontiers in public health, 2023)