American Journal of Preventive Medicine
American Journal of Preventive Medicine > 1999 > 16 > 1 > 16-22
American Journal of Preventive Medicine > 1999 > 17 > 2 > 147-150
American Journal of Preventive Medicine > 1999 > 16 > 1 > 16-22
American Journal of Preventive Medicine > 1999 > 17 > 2 > 147-150