Effectiveness of contact tracing apps for SARS-CoV-2: an updated systematic review. - Kevin Jenniskens; Martin C. J. Bootsma; Johanna A. A. G. Damen; Mona Ghannad; Michiel S. Oerbekke; Meike W. Vernooij; René Spijker; Karel G. M. Moons; Mirjam E. Kretzschmar; Lotty Hooft (F1000Research, 2022)