[1] Oita Univ, Fac Med, Dept Environm & Prevent Med, Yufu, Japan
[2] Oita Univ, Fac Med, Dept Mol Pathol, Yufu, Japan
[3] Global Oita Med Adv Res Ctr Hlth GO MARCH, Yufu, Japan
[4] TamaNagayama Univ Hosp, Nippon Med Sch, Dept Gastroenterol, Tokyo, Japan
[5] Airlangga Univ, Inst Trop Dis, Surabaya, Indonesia
[6] Airlangga Univ, Dept Publ Hlth & Prevent Med, Fac Med, Surabaya, Indonesia
[7] Univ Peradeniya, Dept Surg, Kandy, Sri Lanka
[8] Teaching Hosp Peradeniya, Kandy, Sri Lanka
[9] Baylor Coll Med, Dept Med, Gastroenterol & Hepatol Sect, Houston, TX 77030 USA