[1] Polish Acad Sci, Dept Expt Phys Complex Syst, H Niewodniczanski Inst Nucl Phys, Krakow, Poland
[2] Jagiellonian Univ, Marian Smoluchowski Inst Phys, Krakow, Poland
[3] NCI, Radiat Res Program, NIH, Bethesda, MD 20892 USA
[4] Jagiellonian Univ Med Coll, Dept Epidemiol, Chair Epidemiol & Prevent Med, Krakow, Poland
[5] Polish Acad Sci, Cyclotron Ctr Bronowice, Proton Radiotherapy Grp, H Niewodniczanski Inst Nucl Phys, Krakow, Poland