[1] Brigham & Womens Hosp, Dept Surg, Boston, MA 02215 USA
[2] Harvard Univ, Sch Med, Surg Res Lab, Boston, MA 02115 USA
[3] Harvard Univ, Sch Med, Dept Pathol, Boston, MA 02115 USA
[4] Humboldt Univ, Charite, Dept Surg, Berlin, Germany
[5] Millennium Pharmaceut, Cambridge, MA USA