1. Division of Endocrinology and Metabolism UT Southwestern Medical Center Dallas TX USA
2. Division of Endocrinology, Diabetes, and Nutrition Mayo Clinic Rochester MN USA
3. Department of Medicine Charles University Prague Czech Republic
4. Department of Internal Medicine Mayo Clinic Rochester MN USA
5. Department of Endocrinology and Metabolism Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán Mexico City Mexico
6. Department of Surgery Mayo Clinic Rochester MN USA