[1] Cookridge Hosp, No & Yorkshire Canc Reg & Informat Serv, Leeds LS16 6QB, W Yorkshire, England
[2] Univ Leeds, Ctr Epidemiol & Biostat, Leeds LS2 9LN, W Yorkshire, England
[3] St James Hosp, CRUK Clin Ctr, Leeds LS9 7TF, W Yorkshire, England
[4] Leeds Gen Infirm, Leeds Teaching Hosp, Leeds LS1 3EX, W Yorkshire, England