1. Department of Pediatric Surgery, Hôpital d'Enfants de la Timone, Marseille, France
2. Department of Pediatric Surgery, Hôpital Jeanne de Flandre, Lille, France
3. Department of Pediatric Surgery, Hôpital Saint Jacques, Besançon, France
4. Department of Pediatric Surgery, CHU Caen, Caen, France
5. Department of Pediatric Surgery, CHU Nancy, Nancy, France
6. Department of Pediatric Surgery, Hôpital Robert Debré, Paris, France
7. Department of Pediatric Surgery, Hôpital des Enfants, Toulouse, France
8. Department of Pediatric Surgery, CHU Lyon, Lyon, France
9. Department of Public Health, Université de la Méditérranée, Marseille, France