Nakamura 2020.

Study characteristics
Study design	Mathematical modelling study Description: unspecified Calculation of risk of importation and exportation of COVID‐19 between 1491 airports based on a passenger flow matrix proposed by Huang et al. (2010, Plos One), data on confirmed COVID‐19 cases until March 14 2020, provided by WorldPop and a risk flow calculation proposed by Gilbert et al. (2020, The Lancet)
Disease	COVID‐19
Travel‐related control measure(s)	International travel restrictions Reductions of air travel by 90% (for the airports in the 1st quartile area with regard to cumulative COVID‐19 incidence in airport area), 60% (for the airports in the 2nd quartile) and 30% (for the airports in the 3rd quartile) Date of implementation: n.r.
Country implementing the measure(s)	Country protected by the measure: n.r.  Country restricted by the measure: n.r.
Outcome(s)	Cases avoided due to the measure Outcome: risk of importation and exportation Follow‐up: n.r.
Notes	COI: “The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.” Funding: “This research did not receive any specific grant from funding agencies in the public, commercial, or not‐for‐profit sectors.”