1. Cancer Research UK, The Beatson Institute for Cancer Research, Glasgow G61 1BD, Scotland, UK
2. Department of Clinical Chemistry
3. Department of Pediatrics, Laboratory Genetic Metabolic Diseases, University of Amsterdam, Academic Medical Center, Amsterdam 1105 AZ, Netherlands
4. Division of Medical Genetics, Department of Medicine, University of Pennsylvania, Philadelphia, PA 19104
5. Institut Cochin, Départment de Génétique et Dévelopement, Centre National de la Recherche Scientifique UMR 8104, Institut National de la Santé et de la Recherche Médicale U567 et Université Paris-Descartes, Paris 75014, France