[1] Gunma Univ, Grad Sch Med, Dept Med & Mol Sci, Gunma 3718511, Japan
[2] Maebashi Red Cross Hosp, Dept Gastroenterol, Gunma 3710014, Japan
[3] Isesaki City Hosp, Dept Internal Med, Gunma 3720817, Japan
[4] Kiryu Kousei Gen Hosp, Dept Internal Med, Gunma 3760024, Japan
[5] Tone Chuo Hosp, Dept Internal Med, Gunma 3780053, Japan
[6] Natl Nishigunma Hosp, Dept Gastroenterol, Gunma 3770027, Japan
[7] Saiseikai Maebashi Hosp, Dept Gastroenterol, Gunma 3710821, Japan
[8] Publ Tomioka Gen Hosp, Dept Gastroenterol, Gunma 3702361, Japan
[9] Hlth Insurance Soc Gen Ota Hosp, Fuji Heavy Ind Ltd, Gunma 3730056, Japan
[10] Shimada Mem Hosp, Dept Gastroenterol, Gunma 3750024, Japan