International travel-related control measures to contain the COVID-19 pandemic: a rapid review. - Burns J; Movsisyan A; Stratil JM; Biallas RL; Coenen M; Emmert-Fees KM; Geffert K; Hoffmann S; Horstick O; Laxy M; Klinger C; Kratzer S; et al. (The Cochrane database of systematic reviews, 2021)