The use of test-negative controls to monitor vaccine effectiveness: a systematic review of methodology. Author(s): Chua H, Feng S, Lewnard JA, Sullivan SG, Blyth CC, Lipsitch M, Cowling BJ|Journal: Epidemiology|PMID: 31609860| October 2019 The test-negative design is an increasingly popular approach for estimating vaccine effectiveness (VE) due to its efficiency. This review aims…