1. Division of Endocrinology, Department of Internal Medicine (N.R., A.A.R., S.C.E.), University of Arkansas for Medical Sciences, College of Medicine, Little Rock, Arkansas 72205
2. Research and Medical Services (N.R., S.C.E.), Central Arkansas Veterans Healthcare System, Little Rock, Arkansas 72205
3. Department of Biostatistics (H.J.S.), University of Arkansas for Medical Sciences, College of Medicine, Little Rock, Arkansas 72205