[1] Kobe Univ, Grad Sch Syst Informat, 1-1 Rokkodai,Nada ku, Kobe 6578501, Japan
[2] Univ Alberta, Cross Canc Inst, Dept Oncol, Edmonton, AB T6G 1Z2, Canada
[3] Univ Alberta, Dept Phys, Edmonton, AB T6G 2J1, Canada
[4] Politecn Torino, DIMEAS, Corso Duca Abruzzi 24, I-10129 Turin, Italy