1. Department of Family Medicine, Uniformed Services University, Bethesda, MD
2. Department of Family Medicine, University of Maryland, Baltimore.
3. Department of Preventive Medicine and Biostatistics, Uniformed Services University, Bethesda, MD
4. Department of Mathematics and Statistics, Eastern Michigan University, Ypsilanti, MI
5. Department of Family Medicine, Addis Ababa University College of Health Sciences, Addis Ababa, Ethiopia
6. Department of Family Medicine, University of Michigan, Ann Arbor, MI