[1] Univ Bern, Inst Social & Prevent Med, CH-3012 Bern, Switzerland
[2] Univ Sheffield, Dept Psychol, Western Bank, Sheffield S10 2TN, S Yorkshire, England
[3] Weston Pk Hosp, Acad Unit Clin Oncol, Sheffield, S Yorkshire, England
[4] St Jamess Inst Oncol, Psychosocial Oncol & Clin Practice Res Grp, Leeds, W Yorkshire, England