1. Department of Paediatrics; Dunedin School of Medicine, Otago University; Dunedin New Zealand
2. Département de Génétique; Hôpital Necker-Enfants Malades; Paris France
3. Division of Pediatric Orthopaedics; Seoul National University Children's Hospital; Seoul Korea
4. Department of Clinical Genetics; Great Ormond Street Hospital; London UK
5. Department of Pediatrics, Division of Genetics; Montefiore Medical Center; Bronx NY USA
6. Centre for Fetal Care; Queen Charlotte's and Chelsea Hospital; London UK
7. Department of Clinical Genetics; Copenhagen University Hospital; Rigshospitalet 2100 Copenhagen Denmark
8. Department of Pediatrics; University of Washington School of Medicine; Seattle Washington, DC 98195 USA
9. Department of Pediatrics; Academic Medical Center, University of Amsterdam; Amsterdam The Netherlands