1. Second Department of Surgery—Intensive Care Unit and Endoscopy Unit, Aretaieion University Hospital, 11528 Athens, Greece
2. School of Medicine, University of Patras, 26504 Patras, Greece
3. Third Department of Psychiatry, Dromokaition Psychiatric Hospital, 12461 Athens, Greece
4. Endoscopy Unit, Second Department of Surgery, Aretaieion Hospital, National and Kapodistrian University of Athens, 11528 Athens, Greece
5. Surgical Department, ‘Agia Sofia’ Children’s Hospital, 11527 Athens, Greece
6. Department of Pediatrics, University General Hospital of Patras, University of Patras School of Medicine, 26504 Patras, Greece
7. Second Department of Pediatric Surgery, Aristotle University of Thessaloniki, Papageorgiou General Hospital, 56429 Pavlos Melas, Greece
8. Department of Pediatric Surgery, University General Hospital of Patras, University of Patras School of Medicine, 26504 Patras, Greece