1. Surgical Department, Dr Sulaiman Al Habib Hospital, Riyadh 12987, Saudi Arabia
2. Second Department of Pathology, National and Kapodistrian University of Athens, Attikon University Hospital, 12462 Athens, Greece
3. Third Department of Surgery, National and Kapodistrian University of Athens, Attikon University Hospital, 12462 Athens, Greece
4. Hematology Unit, Second Propaedeutic Department of Internal Medicine and Research Institute, School of Medicine, National and Kapodistrian University of Athens, Attikon University Hospital, 12462 Athens, Greece