1. Department of Pediatrics, Division of Pediatric Endocrinology, University of Minnesota Medical School , Minneapolis, MN 55454 , USA
2. Department of Experimental and Clinical Pharmacology, University of Minnesota College of Pharmacy , Minneapolis, MN 55455 , USA
3. Department of Pediatrics, National Institutes of Health Clinical Center , Bethesda, MD 20892 , USA
4. Eunice Kennedy Shriver National Institute of Child Health and Human Development , Bethesda, MD , USA
5. Medizinische Klinik and Poliklinik IV, Klinikum der Universität München , 80336 Munich , Germany
6. Department of Pediatrics, Amalia Children's Hospital, Radboud University Medical Center , 6500 HB, Nijmegen , The Netherlands
7. Department of Molecular Medicine and Surgery, Karolinska Institutet , SE-17176, Stockholm , Sweden
8. Department of Endocrinology, Karolinska University Hospital , SE-17176, Stockholm , Sweden
9. Departments of Pharmacology and Internal Medicine, Division of Metabolism, Endocrinology and Diabetes, University of Michigan Medical School , Ann Arbor, MI 48109 , USA