[1] Mayo Clin, Coll Med, Div Gastroenterol & Hepatol, Rochester, MN USA
[2] Mayo Clin, Ctr Canc, Rochester, MN USA
[3] Univ Minnesota, Dept Internal Med, Minneapolis, MN USA
[4] Mt Sinai Roosevelt Hosp, Dept Med, New York, NY USA
[5] Mayo Clin, Dept Biomed Stat & Informat, Rochester, MN USA
[6] Mayo Clin, Dept Hlth Sci Res, Div Epidemiol, Rochester, MN USA
[7] Chulalongkorn Univ, Fac Med, Dept Med, Bangkok 10330, Thailand
[8] King Chulalongkorn Mem Hosp, Thai Red Cross Soc, Bangkok, Thailand