Coucke, Paul; Vits, Lleve; Camp, Guy Van; Serville, Francoise; Lyonnet, Stanislas; Kenwrick, Susan; Rosenthal, André; Wehnert, Manfred; Munnich, Arnold; Willems, Patrick J.; Department of Medical Genetics, University of Antwerp-UIAUniversitetsplein 1, 2610 Antwerp, Belgium; Serville Francoise; CHU, Hopital Pellegrin; Lyonnet Stanislas; Unite de Recherches sur les Handicaps Génétiques de I'Enfant INSERM U-12, Hopital des Enfants-Malades; Kenwrick Susan; Department of Medicine, University of Cambridge, Addenbrooke's Hospital; Rosenthal André; Institute of Molecular Biotechnology E.V.; Wehnert Manfred; Institute for Molecular Genetics, Baylor College of Medicine, One Baylor Plaza; Institut fur Medizinische Genetik, Fleischmanstrasse 42/44; Munnich Arnold; Unite de Recherches sur les Handicaps Génétiques de I'Enfant INSERM U-12, Hopital des Enfants-Malades