1. Department of Pathology, University Hospital St. Luc (C.S., Y.G., A.L., J.R.), 1200 Brussels, Belgium
2. Departments of Infantile Surgery (C.N-F.), 75743 Paris, France
3. Pathology (F.J.), 75743 Paris, France
4. Medical Genetics (J-M.S.), Hôpital Necker Enfants Malades, 75743 Paris, France