[1] Johns Hopkins Univ, Inst Med, Howard Hughes Med Inst, Sidney Kimmel Comprehens Canc Ctr, Baltimore, MD 21231 USA
[2] Duke Univ, Med Ctr, Dept Pathol, Durham, NC 27710 USA
[3] Univ Texas, SW Med Ctr, Hamon Ctr Therapeut Oncol Res, Dallas, TX 75390 USA
[4] Univ Texas, SW Med Ctr, Dept Pathol, Dallas, TX 75390 USA
[5] Univ Virginia Hlth Syst, Div Gastroenterol Hepatol, Charlottesville, VA 22908 USA
[6] Univ Hosp Cleveland, Ireland Canc Ctr, Howard Hughes Med Inst, Cleveland, OH 44106 USA
[7] Case Western Reserve Univ, Cleveland, OH 44106 USA