[1] Pamela Youde Nethersole Eastern Hosp, Dept Clin Oncol, Chaiwan, Hong Kong, Peoples R China
[2] Velindre NHS Trust, Cochrane Unit, Cardiff, S Glam, Wales
[3] Velindre NHS Trust, Sect Oncol & Palliat Med, Cardiff, S Glam, Wales
[4] Minneapolis VA Ctr Chron Dis Outcomes Res, Minneapolis, MN USA