1. Department of Cell Biology and Physiology, and Center for the Investigation of Membrane Excitability Diseases; Washington University School of Medicine; St. Louis Missouri
2. Department of Neonatology; Children's Hospital, University of Bonn; Bonn Germany
3. Institute of Human Genetics; University of Bonn; Bonn Germany
4. Pediatric Endocrinology Division; Children's Hospital, University of Bonn; Bonn Germany
5. Department of Pediatrics; Washington University School of Medicine; St. Louis Missouri
6. Department of Medical Genetics; University Medical Center Utrecht; Utrecht The Netherlands
7. Department of Human Genetics; Nijmegen Center for Molecular Life Sciences, Institute for Genetic and Metabolic Disease, Radboud University Nijmegen Medical Center; Nijmegen The Netherlands