1. Fifth Medical Department (Nephrology/Endocrinology/Rheumatology), University Medical Center Mannheim, University of Heidelberg, Mannheim, Germany
2. Department of Endocrinology, The First Affiliated Hospital of Anhui Medical University, Hefei, China
3. Centre for Pediatric and Adolescent Medicine, University of Heidelberg, Heidelberg, Germany
4. Nephrology, University Medical Center Groningen, University of Groningen, Groningen, Netherlands