[1] Tufts Univ New England Med Ctr, Dept Hematol Oncol, Boston, MA 02111 USA
[2] Tufts Univ, Med Ctr, Dept Med, Boston, MA 02111 USA
[3] Massachusetts Gen Hosp, Dept Radiol, Boston, MA 02114 USA
[4] Massachusetts Gen Hosp, Dept Pathol, Boston, MA 02114 USA
[5] Harvard Univ, Sch Med, Boston, MA USA