[1] Univ Tasmania, Menzies Inst Med Res, 17 Liverpool St, Hobart, Tas 7000, Australia
[2] Brown Univ, Sch Publ Hlth, Dept Hlth Serv, Providence, RI 02912 USA
[3] Brown Univ, Sch Publ Hlth, Dept Biostat, Providence, RI 02912 USA
[4] Univ Iowa, Coll Publ Hlth, Dept Epidemiol, Iowa City, IA USA
[5] US FDA, Div Oncol Prod, Silver Spring, MD USA
[6] Harvard Med Sch, Dept Hlth Care Policy, Boston, MA 02115 USA
[7] Brigham & Womens Hosp, Div Gen Internal Med, 75 Francis St, Boston, MA 02115 USA