[1] Peter MacCallum Canc Ctr, Dept Med Oncol, East Melbourne, Australia
[2] Alfred Hosp, Victorian Melanoma Serv, Melbourne, Vic, Australia
[3] Peter MacCallum Canc Ctr, Melbourne, Vic, Australia
[4] Monash Univ, Dept Epidemiol & Prevent Med, Melbourne, Vic 3004, Australia