title: Commentary: Yerushalmy, maternal cigarette smoking and the perinatal mortality crossover paradox.
authors.affiliation: Departments of Epidemiology, Biostatistics and Occupational Health and Pediatrics, McGill University Faculty of Medicine, Montreal, QC, Canada Departments of Epidemiology, Biostatistics and Occupational Health and Pediatrics, McGill University Faculty of Medicine, Montreal, QC, Canada michael.kramer@mcgill.ca.
authors.forename: Michael S
authors.initials: MS
authors.lastname: Kramer
authors.affiliation: Departments of Epidemiology, Biostatistics and Occupational Health and Pediatrics, McGill University Faculty of Medicine, Montreal, QC, Canada.
authors.forename: Xun
authors.initials: X
authors.lastname: Zhang
authors.affiliation: Departments of Epidemiology, Biostatistics and Occupational Health and Pediatrics, McGill University Faculty of Medicine, Montreal, QC, Canada Departments of Epidemiology, Biostatistics and Occupational Health and Pediatrics, McGill University Faculty of Medicine, Montreal, QC, Canada.
authors.forename: Robert W
authors.initials: RW
authors.lastname: Platt