1. Departments of Pediatric Endocrinology, Diabetes, and Nutrition Medicine (T.R.), D-45711 Datteln, Germany
2. Paediatric Endocrinology Division (J.W.), Children's Hospital, University of Bonn, D-53127 Bonn, Germany
3. Pediatric Radiology and Ultrasound (R.W.), Vestische Hospital for Children and Adolescents Datteln, University of Witten/Herdecke, D-45711 Datteln, Germany
4. Seattle Children's Research Institute (C.L.R.), University of Washington, Seattle, Washington 98105