1. Division of Endocrinology, Diabetes and Metabolism, Saint Louis University, St. Louis, Missouri, USA.
2. Medical Center Hospital ProCare, Endocrinology, Odessa, Texas, USA.
3. Permian Basin Kidney Center, Odessa, Texas, USA.
4. Department of Medicine, Section of Endocrinology, West Virginia University, Morgantown, West Virginia, USA.
5. Division of Endocrinology, Diabetes and Metabolism, State University of New York at Buffalo, Williamsville, New York, USA.