Efstratios Christianakis1
, Nikolaos Paschalidis2
, Georgios Filippou2
, Maria Chorti3
, Nikolaos Andromanakos2
, Michael Pitiakoudis2
, Spiros Rizos2
and Dimitrios Filippou2 
1Department of Paediatric Surgery, Penteli's Children's Hospital, Athens, Greece
2First Department of General Surgery, Piraeus General Hospital "Tzaneio", Piraeus-Athens, Greece
3Department of Pathology, Athens General Hospital "Sismanoglion", Brilisia, Athens, Greece