[1] Massachusetts Gen Hosp, Div Gastrointestinal & Oncol Surg, Boston, MA 02114 USA
[2] Harvard Med Sch, Boston, MA 02115 USA
[3] MIT, Harvard MIT Hlth Sci & Technol, Cambridge, MA 02139 USA
[4] Massachusetts Gen Hosp, Wellman Ctr Photomed, Boston, MA 02114 USA
[5] Massachusetts Gen Hosp, Div Thorac Surg, Boston, MA 02114 USA