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Canadian Journal of Public Health > 2010 > 101 > 3 > 241-245
Social Science Research > 2007 > 36 > 1 > 254-285
American Journal of Preventive Medicine > 2000 > 18 > 1 > 62-68
Canadian Journal of Public Health > 2010 > 101 > 3 > 241-245
Social Science Research > 2007 > 36 > 1 > 254-285
American Journal of Preventive Medicine > 2000 > 18 > 1 > 62-68