1. Department of Surgical Oncology, General Anticancer and Oncological Hospital of Athens “Saint Savvas” , Athens , Greece
2. 2nd Department of Surgery, Athens Naval and Veterans Hospital , Athens , Greece
3. Department of Pathology, General Anticancer and Oncological Hospital of Athens “Saint Savvas” , Athens , Greece
4. Department of General Surgery, Lankenau Medical Center , Wynnewood, PA , United States