1. Pediatric Surgeon, Volos, Greece
2. Department of Pediatric Surgery, University of Patras Medical School, Patras, Greece
3. Department of Pediatric Surgery, Aristotelian University of Thessaloniki Medical School, Thessaloniki, Greece
4. Department of Pediatrics, University of Patras Medical School, Patras, Greece
5. Department of Pediatric Surgery, Hippocrateion General Hospital, Thessaloniki, Greece