1. Imprinting and Cancer group, Cancer Epigenetic and Biology Program, Bellvitge Biomedical Research Institute, Barcelona, Spain
2. European Molecular Biology Laboratory, European Bioinformatics Institute, Wellcome Trust Genome Campus, Hinxton, Cambridge, UK
3. Human Genetics and Clinical Genetics, Leiden University Medical Center, Leiden, the Netherlands
4. Laboratory of Cytogenetics and Molecular Genetics, Istituto Auxologico Italiano, Milan, Italy
5. Reproduction and Developmental Genetics, Centre National de la Recherche Scientifique, Clermont-Ferrand, France
6. Center for Pediatrics and Adolescent Medicine, Johannes Gutenberg University Medical Center, Obere Zahlbacher, Mainz, Germany
7. Institute of Human Genetics, Technical University of Aachen, Aachen, Germany
8. Institute of Human Genetics, University Hospital Essen, University Duisburg-Essen, Germany
9. Applied Human Molecular Genetics, Kennedy Centre, Copenhagen University Hospital, Rigshospitalet, Glostrup, Denmark