1. Center for Medical Genetics, Ghent University Hospital, Ghent, Belgium
2. Department of Pediatrics, Washington University School of Medicine, St. Louis, Missouri
3. Institut für Humangenetik, Universitätsklinikum Essen, Essen, Germany
4. Department of Dermatology, University of Heidelberg, Heidelberg, Germany
5. Department of Clinical Genetics, Churchill Hospital, Oxford, United Kingdom
6. Centro de Genética Médica Doutor Jacinto Magalhães, INSARJ, Porto, Portugal
7. Department of Pediatrics, Hospital de Crianças Maria Pia, Centro Hospitalar do Porto, Porto, Portugal
8. Department of Clinical Chemistry, Hoshi University School of Pharmacy and Pharmaceutical Sciences, Tokyo, Japan
9. Department of Cell Biology and Physiology, Washington University School of Medicine, St. Louis, Missouri
10. Center of Medical Genetics, University of Antwerp, Antwerp, Belgium
11. Department of Human Genetics, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania