1. Department of General Pediatrics, Neonatology and Pediatric Cardiology, Medical Faculty and University Hospital Düsseldorf, Heinrich Heine University Düsseldorf, D-40225 Düsseldorf, Germany
2. Institute of Metabolic Physiology, Heinrich Heine University Düsseldorf, D-40225 Düsseldorf, Germany
3. Department of Pediatrics and Adolescent Medicine, Pediatric Endocrinology, University Medicine Göttingen, D-37075 Göttingen, Germany
4. Medizinische Genetik Mainz, Limbach Genetics, D-55128 Mainz, Germany