title: [Time-dependent confounding bias and follow-up duration time bias in cohort studies].
authors.affiliation: National Center for AIDS/STD Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China.
authors.forename: Huixin
authors.initials: H
authors.lastname: Liu
authors.affiliation: National Center for AIDS/STD Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China.
authors.forename: Yingying
authors.initials: Y
authors.lastname: Su
authors.affiliation: National Center for AIDS/STD Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China.
authors.forename: Zheng
authors.initials: Z
authors.lastname: Li
authors.affiliation: National Center for AIDS/STD Control and Prevention, Chinese Center for Disease Control and Prevention, Beijing 102206, China. Email: wangnbj@163.com.
authors.forename: Ning
authors.initials: N
authors.lastname: Wang
mesh_terms: D015982:Bias; D015331:Cohort Studies; D005500:Follow-Up Studies; D006801:Humans; D013997:Time Factors