[1] Northwestern Univ, Dept Surg, Chicago, IL USA
[2] Massachusetts Gen Hosp, Harvard Med Sch, Dept Surg, Boston, MA USA
[3] Univ Pittsburgh, Dept Surg, Pittsburgh, PA USA
[4] Johns Hopkins Univ, Dept Surg, Baltimore, MD USA
[5] Univ Rochester, Dept Surg, Rochester, NY USA
[6] Univ Alabama Birmingham, Dept Surg, Birmingham, AL USA
[7] Emory Univ, Dept Surg, Atlanta, GA USA
[8] Univ Penn, Dept Surg, Philadelphia, PA USA
[9] Univ Calif San Francisco, Dept Surg, San Francisco, CA USA
[10] Univ Michigan, Dept Surg, Ann Arbor, MI USA
[11] Washington Univ, Dept Surg, St Louis, MO USA
[12] Univ Maryland, Dept Surg, Baltimore, MD USA
[13] Univ Calif Los Angeles, Dept Surg, Los Angeles, CA USA
[14] Univ Washington, Dept Surg, Seattle, WA 98195 USA
[15] Brigham & Womens Hosp, Harvard Med Sch, Dept Surg, Boston, MA USA
[16] Stanford Univ, Dept Surg, Palo Alto, CA USA
[17] Univ Calif San Diego, Dept Surg, San Diego, CA USA
[18] Univ Miami, Dept Surg, Miami, FL USA
[19] Ohio State Univ, Dept Surg, Columbus, OH USA
[20] Univ Wisconsin, Dept Surg, Madison, WI USA
[21] Columbia Univ, Dept Surg, New York, NY USA
[22] NCI, NIH, Bethesda, MD USA
[23] Univ Calif Davis, Dept Surg, Davis, CA USA
[24] Duke Univ, Dept Surg, Durham, NC USA