Russell TW 2020.

Study characteristics
Study design	Mathematical modelling study Description: comparison of total incidence and imported cases Imported cases via international air travel considered Prevalences were adjusted for country‐specific under‐ascertainment
Disease	COVID‐19
Travel‐related control measure(s)	International travel restrictions, border closure or quarantine of travellers Defined as any measure that completely or almost completely prevents international arrivals from contributing to local transmission, such as entry bans and compulsory 14‐day facility‐based quarantines Date of implementation: n.r.
Country implementing the measure(s)	Country protected by the measure: multiple countries (142) Country restricted by the measure: n.r.
Outcome(s)	Cases avoided due to the measure Outcome: proportion of imported cases in overall cases Follow‐up: the month of May 2020
Notes	COI: “We declare no competing interests.” Funding: “Wellcome Trust, UK Department for International Development, European Commission, National Institute for Health Research, Medical Research Council, Bill & Melinda Gates Foundation.”