1. Institute of Human Genetics, Christian-Albrechts-University Kiel & University Hospital Schleswig-Holstein, Campus Kiel, D 24105 Kiel, Germany
2. Institut für Humangenetik, Universitätsklinikum Essen, Universität Duisburg-Essen, D 45122 Essen, Germany
3. Institute of Human Genetics, University Hospital Aachen, D 52074 Aachen, Germany
4. Institut für Humangenetik Lübeck, Universität zu Lübeck, D 23562 Lübeck, Germany
5. Section of Molecular Pediatrics University Medical Centre of the Johannes Gutenberg-University Mainz, D 55131 Mainz, Germany
6. Division of Experimental Paediatric Endocrinology & Diabetes, Department of Paediatrics, University of Lübeck, D 23562 Lübeck, Germany
7. Institut d'Investigació Biomedica de Bellvitge (IDIBELL), Cancer Epigenetic & Biology Program (PEBC), Catalan Institute of Oncology, Hospital Duran i Reynals Barcelona, Barcelona, ES 08907, Spain