Chen T 2020.

Study characteristics
Study design	Mathematical modelling study Description: modified deterministic SEIR model
Disease	COVID‐19
Travel‐related control measure(s)	Quarantine of travellers and entry restrictions Quarantine of travellers crossing national borders Entry restrictions at national borders for different intensity of restriction Target group: all inbound passengers and symptomatic travellers only Date of implementation: 13 March 2020: new visitors from Italy, France, Germany and Spain were not allowed entry into Singapore; 23 March 2020: all short‐term visitors were prohibited from entering or transition through Singapore
Country implementing the measure(s)	Country protected by the measure: China, Singapore Countries restricted by the measure: all other countries
Outcome(s)	Cases avoided due to the measure  Outcome 1: number of cases in community Outcome 2: number of imported cases Follow‐up: 21 May 2020
Notes	COI: “We declare no competing interests” Funding: “None.”