title: The authors respond.
authors.affiliation: Department of Epidemiology, Mailman School of Public Health Columbia University, New York, NY, Epidemiology, Worldwide Safety & Regulatory, Pfizer Inc, New York, NY, nicolle.gatto@pfizer.com Department of Epidemiology, Mailman School of Public Health Columbia University, New York, NY.
authors.forename: Nicolle M
authors.initials: NM
authors.lastname: Gatto
authors.forename: Ulka B
authors.initials: UB
authors.lastname: Campbell
authors.forename: Sharon
authors.initials: S
authors.lastname: Schwartz
mesh_terms: D015984:Causality; D016021:Epidemiologic Studies; D006801:Humans; D012306:Risk