title: Author response: Letter to the editor: A critical analysis: Why "firm conclusions are not possible".
authors.affiliation: University of Waterloo, School of Public Health and Health Systems, Waterloo, Ontario, Canada. Electronic address: l2jalali@uwaterloo.ca.
authors.forename: Leila
authors.initials: L
authors.lastname: Jalali
authors.affiliation: University of Waterloo, School of Public Health and Health Systems, Waterloo, Ontario, Canada.
authors.forename: Mahmood
authors.initials: M
authors.lastname: Gohari
authors.affiliation: University of Waterloo, School of Public Health and Health Systems, Waterloo, Ontario, Canada.
authors.forename: Philip
authors.initials: P
authors.lastname: Bigelow
authors.affiliation: University of Waterloo, School of Public Health and Health Systems, Waterloo, Ontario, Canada.
authors.forename: Stephen
authors.initials: S
authors.lastname: McColl
authors.affiliation: University of Waterloo, Electrical and Computer Engineering, Waterloo, Ontario, Canada.
authors.forename: Mohammad-Reza
authors.initials: MR
authors.lastname: Nezhad-Ahmadi