| Affiliation: | 1. Department of Family and Preventive Medicine, College of Medicine, University of Oklahoma Health Sciences Center, 900 NE 10th St., Oklahoma City, OK 73104, USA;2. P.O. Box 26901, Rm. 453, Department of Health Promotion Sciences, College of Public Health, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73126-0901, USA;3. Post Office Box 26901, Room 358, Department of Biostatistics and Epidemiology, College of Public Health, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73126-0901, USA |
