YUNG-LING LEE2018-09-102018-09-102011http://www.scopus.com/inward/record.url?eid=2-s2.0-80053439045&partnerID=MN8TOARShttp://scholars.lib.ntu.edu.tw/handle/123456789/367324Time-dependent exposures and the fixed-cohort bias: Hwang et al. Respondjournal article