1. Hygeia Hospital, Erithrou Stavrou 4, 15123 Marousi, Greece
2. ECONCARE, Chatzigianni Mexi 5, 11528 Athens, Greece
3. Laboratory of Biology, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
4. Radiation Oncology Unit, 2nd Department of Radiology, Attikon University Hospital, Medical School, National and Kapodistrian University of Athens, 11527 Athens, Greece
5. Euroclinic, Athanasiadou 7-9, 11521 Athens, Greece