[1] Harvard Univ, Sch Med, Joslin Diabet Ctr, Sect Immunol & Immunogenet, Boston, MA 02215 USA
[2] Harvard Univ, Sch Med, Brigham & Womens Hosp, Dept Med, Boston, MA 02215 USA
[3] Harvard Univ, Sch Med, Dana Farber Canc Inst, Dept Med Oncol, Boston, MA 02215 USA