[1] SUNY Upstate Med Univ, Dept Med, Syracuse, NY 13210 USA
[2] Univ Rochester, Sch Med, James P Wilmot Canc Ctr, Rochester, NY 14627 USA
[3] Duke Univ, Ctr Stat, Canc & Leukemia Grp B, Durham, NC 27706 USA
[4] Univ Minnesota, Sch Med, Div Oncol, Minneapolis, MN 55455 USA
[5] Univ Penn, Ctr Canc, Philadelphia, PA 19104 USA
[6] Univ Penn, Abramson Family Canc Res Inst, Philadelphia, PA 19104 USA
[7] Harvard Univ, Sch Med, Dana Farber Canc Inst, Boston, MA 02115 USA
[8] British Columbia Canc Agcy, Vancouver Canc Ctr, Vancouver, BC V5Z 4E6, Canada