[1] Alexandra Peripheral Gen Hosp, Athens, Greece
[2] Univ Athens, Athens, Greece
[3] Hellen Cooperat Oncol Grp Data Off, Athens, Greece
[4] Univ Thessalia, Larisa, Greece
[5] Agioi Anargiroi Hosp, Athens, Greece
[6] Univ Thessaloniki, GR-54006 Thessaloniki, Greece
[7] Hellen Cooperat Oncol Grp HeCOG, Athens, Greece