1. Unit of Pediatric Surgery, Unit of Pediatrics, Competence Centre for Rare Esophageal Diseases University Hospital Center of Orléans Orléans France
2. Reference Centre for Rare Esophageal Diseases University of Lille, CHU Lille Lille France
3. Biostatistics Unit University Hospital of Lille Lille France
4. Biostatistics Unit University Hospital Center of Orléans Orléans France