title: Commentary: On the Use of Imperfect Negative Control Exposures in Epidemiologic Studies.
authors.affiliation: From the aDepartment of Environmental Health, bDepartment of Epidemiology, cDepartment of Biostatistics, Harvard T.H. Chan School of Public Health, Boston, MA; and dFaculty of Medicine, Braun School of Public Health & Community Medicine, Hebrew University-Hadassah, Jerusalem, Israel.
authors.forename: Marc G
authors.initials: MG
authors.lastname: Weisskopf
authors.forename: Eric J
authors.initials: EJ
authors.lastname: Tchetgen Tchetgen
authors.forename: Raanan
authors.initials: R
authors.lastname: Raz
mesh_terms: D015982:Bias; D015986:Confounding Factors, Epidemiologic; D006801:Humans; D019370:Observation