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James F. Sallis is with the Department of Psychology at San Diego State University, 6363 Alvarado Court, #103, San Diego, CA 92120. Kevin Patrick is with the General Preventive Medicine Residency at the University of California–San Diego State University, Student Health Services, San Diego State University, San Diego, CA 92182 and with the Office of Disease Prevention and Health Promotion, U.S. Public Health Service. Barbara J. Long is with Student Health Services at San Diego State University, San Diego, CA 92182.