1. Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas (S.M.A., A.R., D.K.M., J.A.D., S.M.G., J.D.B., A.K.).
2. Veteran’s Affairs North Texas Medical Center, Dallas (S.M.A., S.M.G.).
3. The Cooper Institute, Dallas, TX (L.F.D., D.L., C.E.B., B.L.W.).
4. The Cooper Clinic, Dallas, TX (N.B.R.).