1. Pediatric Surgery Unit, Department of Clinical-Surgical, Diagnostic and Pediatric Sciences; University of Pavia; Pavia Italy
2. Institute of Pathologic Anatomy; University of Trieste; Trieste Italy
3. Pediatric Unit, Department of Internal Medicine; University of Pavia; Pavia Italy
4. Department of Maternal and Children's Health, Pediatric Unit; Fondazione IRCCS Policlinico San Matteo Pavia; Pavia Italy
5. Cinicinnati Fetal Center, The Center for Fetal, Cellular, and Molecular Therapy; Pediatric Surgery Division, CCHMC; Cincinnati OH USA
6. Fetal Surgery Program, Congenital Malformations Research Group; Research Institute of Hospital Universitari Vall d'Hebron, Edifici Infantil; Barcelona Spain