1. Department of Pediatrics, University of Kiel, D-24105 Kiel, Germany
2. Labor Becker, Olgemöller & Kollegen, D-81737 Munich, Germany
3. MRC Human Genetics Unit, Western General Hospital, Edinburgh EH4 2XU, United Kingdom
4. Dr. von Hauner Children’s Hospital, Department of Clinical Chemistry and Biochemical Genetics, University of Munich, D-80337 Munich, Germany