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Preventive Medicine > 2002 > 34 > 3 > 393-396
American Journal of Preventive Medicine > 2002 > 22 > 2 > 106-109
American Journal of Preventive Medicine > 2000 > 19 > 4 > 264-269
Preventive Medicine > 2002 > 34 > 3 > 393-396
American Journal of Preventive Medicine > 2002 > 22 > 2 > 106-109
American Journal of Preventive Medicine > 2000 > 19 > 4 > 264-269