[1] Inst Oncol Cluj, Cluj Napoca, Romania
[2] Sbalo Natl Oncol Ctr, Sofia, Bulgaria
[3] Inst Oncol, Ljubljana, Slovenia
[4] Inst Oncol, Sarajevo, Bosnia & Herceg
[5] Natl Canc Inst, Bratislava, Slovakia
[6] Banc Cyprus Oncol Ctr, Nicosia, Cyprus
[7] Univ Hosp Rebro, Zagreb, Croatia
[8] Med Univ Vienna, Vienna, Austria