[1] MASSACHUSETTS GEN HOSP, DIV PEDIAT SURG, PEDIAT SURG RES LAB, BOSTON, MA 02114 USA
[2] MASSACHUSETTS GEN HOSP, CELLULAR & MOLEC RES LAB, BOSTON, MA 02114 USA
[3] HARVARD UNIV, SCH MED, DEPT SURG, BOSTON, MA 02115 USA
[4] HARVARD UNIV, SCH MED, DEPT PATHOL, BOSTON, MA 02115 USA