Efstratios Christianakis1
, Anastasios Sakelaropoulos2
, Constantinos Papantzimas3
, Michael Pitiakoudis4
, Georgios Filippou5
, Dimitrios Filippou5
, Spiros Rizos5
and Nikolaos Paschalidis5 
1
Dept. of Paediatric Surgery, Pendeli Children's Hospital, Palea Pendeli, Athens, Greece
2
Department of Radiology, Pendeli Children's Hospital, Palea Pendeli, Athens, Greece
3
First Paediatric Department, Pendeli Children's Hospital, Palea Pendeli, Athens, Greece
4
Department of Surgery, Medical School, University of Thrace, Alexandroupoli, Greece
5
Department of Anatomy, Nursing Faculty, University of Athens, Athens, Greece