[1] Metropolitan Hosp, Dept Med Oncol 2, Athens 18547, Greece
[2] Univ Athens, Sch Nursing, Lab Biostat, Athens, Greece
[3] Agii Anargiri Canc Hosp, Athens, Greece
[4] Univ Patras, Sch Med, GR-26110 Patras, Greece
[5] Aristotle Univ Thessaloniki, AHEPA Hosp, Sch Med, GR-54006 Thessaloniki, Greece
[6] Social Secur Org Oncol Ctr, Athens, Greece
[7] Hippokrateion Hosp, Athens, Greece