[1] Harvard Univ, Massachusetts Gen Hosp, Sch Med, Dept Surg,NMR Surg Lab,Shriners Burns Inst, Boston, MA 02114 USA
[2] Harvard Univ, Childrens Hosp, Sch Med, Dept Biostat, Boston, MA 02115 USA
[3] Harvard Univ, Childrens Hosp, Sch Med, Dept Orthopaed Surg, Boston, MA 02115 USA
[4] Harvard Univ, Childrens Hosp, Sch Med, Dept Pathol, Boston, MA 02115 USA
[5] Harvard Univ, Childrens Hosp, Sch Med, Dept Neurosurg, Boston, MA 02115 USA
[6] Univ Missouri, Dept Pathol & Anat Sci, Columbia, MO USA
[7] Harvard Univ, Massachusetts Gen Hosp, Sch Med, Dept Radiat Oncol, Boston, MA USA