1. Oncodéfi and University Institute for Clinical Research, Epidemiology and Biostatistics Department (EA 2415); Montpellier France
2. Department of Fundamental Health Sciences; Health Sciences University of Hokkaido; Tobetsu Japan
3. Pediatric Oncology; CHU Arnaud de Villeneuve; Montpellier France
4. Department of Genetics; Hôpital Necker Enfants Malades, and Institut Imagine; Université Paris Descartes; Paris France
5. Department of Pathology; University Hospital; Strasbourg France
6. Support Organization for Trisomy 18, 13 and Related Disorders − Surgery Registry (SOFT-SR) Rochester; Rochester New York