American Journal of Preventive Medicine
American Journal of Preventive Medicine > 1998 > 14 > 3 > 217-223
American Journal of Preventive Medicine > 1999 > 16 > 3 > 202-207
American Journal of Preventive Medicine > 1999 > 17 > 1 > 43-47
American Journal of Preventive Medicine > 1998 > 14 > 3 > 217-223
American Journal of Preventive Medicine > 1999 > 16 > 3 > 202-207
American Journal of Preventive Medicine > 1999 > 17 > 1 > 43-47