[1] Harvard Univ, Sch Med, Dept Canc Immunol & AIDS, Boston, MA 02115 USA
[2] Harvard Univ, Sch Med, Dana Farber Canc Inst, Boston, MA 02115 USA
[3] Harvard Univ, Sch Med, Dept Pathol, Boston, MA 02115 USA
[4] Harvard Univ, Sch Publ Hlth, Dept Immunol & Infect Dis, Boston, MA 02115 USA