1. From the Departments of Pediatrics (MSK and RWP) and Epidemiology and Biostatistics (MSK, RWP, J-PC, and SS), McGill University Faculty of Medicine, Montreal, PQ, Canada; the National Research and Applied Medicine Mother and Child Centre, Minsk, Belarus (LM, IV, NB, ZS, ID, and GS); the Department of Social Medicine, University of Bristol, Bristol, United Kingdom (RMM and GDS); the Department of