[1] Univ Leeds, Clin Trials Res Unit, Leeds, W Yorkshire, England
[2] Univ Leeds, St James Hosp, Canc Res UK Clin Ctr, Leeds LS9 7TF, W Yorkshire, England
[3] Univ Aberdeen, Dept Publ Hlth, Aberdeen, Scotland
[4] NTNU, Dept Canc Res & Mol Med, Trondheim, Norway
[5] Univ Sydney, Psychooncol Cooperat Res Grp, Sydney, NSW 2006, Australia