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Karki, Sudip Jung 
ORCID: 0000-0002-9643-9987, Joachim, Alexandar, Heinsohn, Torben ORCID: 0000-0002-1175-2633 and Lange, Berit
(2021).
Risk of infection and contribution to transmission of SARS-CoV-2 in school staff: a systematic review.
BMJ Open, 11 (11).
LONDON:
BMJ PUBLISHING GROUP.
ISSN 2044-6055