1. Duke Clinical Research Institute, Division of Nephrology, Department of Medicine, Duke University School of Medicine, Durham, North Carolina
2. Division of Endocrinology, Department of Medicine, University of North Carolina at Chapel Hill
3. Harvard Medical School, Boston, Massachusetts
4. Division of Endocrinology, Department of Medicine, Indiana University School of Medicine, Indianapolis
5. Department of Clinical and Non-clinical Research, Pharmacosmos A/S, Holbæk, Denmark
6. Department of Pediatrics (Endocrinology), Yale University School of Medicine, New Haven, Connecticut
7. Division of Endocrinology, Metabolism and Nutrition, Department of Medicine, Duke University School of Medicine, Durham, North Carolina
8. Rhein-Maas Klinikum Würselen, Würselen, Germany
9. Department of Medicine I, Medical University of Innsbruck, Innsbruck, Austria