1. Department of Pediatric Endocrinology, Diabetes, and Nutrition Medicine (T.R., B.W., N.L.), Vestische Hospital for Children and Adolescents Datteln, University of Witten/Herdecke, D-45711 Datteln, Germany
2. Division of Pediatric Endocrinology and Diabetes (A.K., M.W., F.R., P.-M.H.), Department of Pediatrics, University Hospital of Schleswig-Holstein, Albrechts University of Kiel, D-24098 Kiel, Germany