[1] Massachusetts Gen Hosp, Ctr Canc, Boston, MA USA
[2] Dana Farber Canc Inst, Boston, MA 02115 USA
[3] Dana Farber Canc Inst, Int Beast Canc Study Grp Stat Ctr, Boston, MA 02115 USA
[4] Harvard Univ, Massachusetts Gen Hosp, Sch Med, Ctr Canc, Boston, MA USA
[5] Beth Israel Deaconess Med Ctr, Boston, MA 02215 USA
[6] Georgetown Univ, Lombardi Comprehens Canc Ctr, Washington, DC USA