[1] USC Norris Comprehens Canc Ctr, Div Med Oncol, Los Angeles, CA USA
[2] Ludwig Maximilian Univ Munich, Munich, Germany
[3] USC Norris Comprehens Canc Ctr, Dept Prevent Med, Los Angeles, CA USA
[4] Kumamoto Univ, Grad Sch Med Sci, Dept Surg Gastroenterol, Kumamoto, Japan
[5] Ludwig Maximilian Univ Munich, Comprehens Canc Ctr, Munich, Germany
[6] USC Norris Comprehens Canc Ctr, Los Angeles, CA USA