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Canadian Journal of Public Health > 2009 > 100 > 4 > 263-267
European Journal of Epidemiology > 1999 > 15 > 2 > 171-174
Canadian Journal of Public Health > 2009 > 100 > 4 > 263-267
European Journal of Epidemiology > 1999 > 15 > 2 > 171-174