[1] Okayama City Hosp, Dept Gastroenterol, Okayama 7008558, Japan
[2] Mitsui Mem Hosp, Tokyo 1018643, Japan
[3] Kanazawa Univ, Kanazawa, Ishikawa 9201192, Japan
[4] Hyogo Coll Med, Nishinomiya, Hyogo 6638501, Japan
[5] Taipei Vet Gen Hosp, Taipei 11217, Taiwan
[6] Samsun Med Ctr, Seoul 06351, South Korea
[7] Seoul Natl Univ Hosp, Seoul 03080, South Korea
[8] Asan Med Ctr, Seoul 05505, South Korea
[9] Tata Mem Hosp, Mumbai 400012, Maharashtra, India
[10] Rela Inst & Med Ctr, Chennai 600044, Tamil Nadu, India
[11] Yokokura Hosp, Fukuoka 8390295, Japan