Increasing Referral of At-Risk Travelers to Travel Health Clinics: Evaluation of a Health Promotion Intervention Targeted to Travel Agents. - MacDougall, Laura A.; Gyorkos, Theresa W.; Leffondre, Karen; Abrahamowicz, Michal; Tessier, Dominique; Ward, Brian J.; MacLean, J. Dick (Journal of Travel Medicine, 2001)