[1] Med Univ Gdansk, Gdansk, Poland
[2] Istanbul Univ, Istanbul, Turkey
[3] Sf Maria Hosp, Bucharest, Romania
[4] Vilnius State Univ, Inst Oncol, Vilnius, Lithuania
[5] Riga East Univ Hosp, Riga, Latvia
[6] Univ Szeged, Szeged, Hungary
[7] Kidwai Mem Inst Oncol, Bangaluru, India
[8] Comenius Univ, Natl Canc Inst, Bratislava, Slovakia
[9] Comenius Univ, Sch Med, Bratislava, Slovakia
[10] ECZ, Med Ctr Postgrad Educ, Otwock, Poland
[11] NN Petrov Oncol Res Inst, St Petersburg, Russia
[12] Inst Oncol & Radiol, Belgrade, Serbia
[13] Chemiotherapy Clin, Sofia, Bulgaria
[14] Univ Zagreb, Ctr Hosp, Zagreb 41000, Croatia
[15] Warsaw Sch Econ, Warsaw, Poland