1. aDepartment of Pediatric General Surgery, Regina Margherita Children's Hospital, Azienda Ospedaliero Universitaria Città della Salute e della Scienza, Turin, Italy
2. bStem Cell and Regenerative Medicine Section, GOSICH Zayed Centre for Research into Rare Disease in Children, University College London, London, United Kingdom
3. cDepartment of Histopathology, NIHR Great Ormond Street Hospital BRC, London, United Kingdom
4. dDepartment of Specialist Neonatal and Paediatric Surgery, NIHR Great Ormond Street Hospital BRC, London, United Kingdom