[1] Fred Hutchinson Canc Res Ctr, Publ Hlth Sci Div, 1124 Columbia St, Seattle, WA 98104 USA
[2] Brigham & Womens Hosp, Surg Oncol, 75 Francis St, Boston, MA 02115 USA
[3] Allegheny Gen Hosp, Allegheny Canc Ctr, Pittsburgh, PA 15212 USA
[4] Emory Univ, Winship Canc Inst, Med Dept, Atlanta, GA 30322 USA
[5] Univ Penn, Med Oncol, Franklin Bldg, Philadelphia, PA 19104 USA
[6] Verwoerd Hosp, Med Oncol, Pretoria, South Africa
[7] Stephenson Canc Ctr, Med Oncol, Oklahoma City, OK USA
[8] Univ Pittsburgh, Biostat, Pittsburgh, PA USA
[9] Dana Farber Canc Inst, Biostat, Boston, MA 02115 USA
[10] Harvard Univ, Biostat, Boston, MA 02115 USA
[11] Fred Hutchinson Canc Res Ctr, Publ Hlth Sci Div, 1124 Columbia St, Seattle, WA 98104 USA
[12] SWOG Canc Res Network, Med Dept, Portland, OR USA