1. UT Southwestern Medical School , Dallas, TX 75390 , USA
2. Department of Internal Medicine, Division of Endocrinology, Diabetes and Metabolism, Mercy Clinic , Festus, MO 63028 , USA
3. Department of Internal Medicine, Division of Endocrinology, UT Southwestern Medical Center , Dallas, TX 75390 , USA
4. St. Joseph's/Candler Physician Network–Endocrinology , Savannah, GA 31405 , USA
5. Department of Internal Medicine, VA North Texas , Dallas, TX 75216 , USA