[1] Int Univ Hlth & Welf Hosp, Dept Surg, Nasushiobara, Tochigi 3292763, Japan
[2] Jikei Univ, Sch Med, Dept Mol Epidemiol, Minato Ku, 3-25-8 Nishi Shimbashi, Tokyo, Japan
[3] Tokyo Musashino Hosp, Dept Internal Med, Itabashi Ku, Tokyo, Japan
[4] Suzuki Internal Med Clin, Nagareyama, Chiba 2700157, Japan
[5] Haramachi Red Cross Hosp, Dept Surg, Gunma 3770882, Japan
[6] Kitamihara Clin, Dept Surg, Hakodate, Hokkaido 0410802, Japan
[7] Seiwa Mem Hosp, Dept Internal Med, Nishi Ku, Sapporo, Hokkaido 0630811, Japan
[8] Kanto Cent Hosp, Dept Neurol, Tokyo 1588531, Japan
[9] Tone Chuou Hosp, Dept Surg, Numata, Gunma 378005, Japan
[10] Toho Univ, Ohashi Med Ctr, Dept Internal Med, Div Gastroenterol,Meguro Ku, Tokyo, Japan
[11] JA Toride Med Ctr, Dept Neurol, Toride, Ibaraki 3020022, Japan
[12] Uchida Hosp, Internal Dept, Numata, Gunma 3780005, Japan
[13] Ohfuna Chuo Hosp, Ctr Digest & Liver Dis, Kamakura, Kanagawa 2470056, Japan
[14] Isesaki City Hosp, Dept Internal Med, Isesaki, Gunma 3720812, Japan
[15] Nakamura Mem Hosp, Dept Surg, Sapporo, Hokkaido 0608570, Japan
[16] Sapporo Shirakaba Dai Hosp, Dept Gastroenterol, Sapporo, Hokkaido 0620052, Japan
[17] Okano clin, Dept Gastroenterol, Sakyo Ku, Kyoto, Kyoto 6068411, Japan
[18] Tokyo Metropolitan Ohkubo Hosp, Dept Surg, Sinnjyuku Ku, Tokyo, Japan
[19] Kyoto Kujo Hosp, Dept Internal Med, Minami Ku, Kyoto, Kyoto 6018485, Japan
[20] Kanazawa Nishi Hosp, Dept Surg, Kanazawa, Ishikawa 9200025, Japan
[21] Onishi Hosp, Dept Surg, Fujika, Gunma 3701401, Japan
[22] Tsuruika Kyouritsu Hosp, Dept Internal Med, Tsuruoka, Yamagata 9970816, Japan
[23] Niigata Joetsu Gen Hosp, Japan Agr Cooperat, Dept Gastroenterol & Hepatol, Joetsu, Niigata 9438507, Japan
[24] Hirosaki Municipal Hosp, Dept Gastroenterol, Hirosaki, Aomori 0368004, Japan
[25] Shimonoseki Welf Hosp, Dept Gastroenterol, Shimonoseki, Yamaguchi 7500061, Japan
[26] Tokatsu Clin Hosp, Dept Surg, Matsudo, Chiba 2710067, Japan
[27] Maebashi Red Cross Hosp, Dept Surg, Maebashi, Gunma 3710014, Japan
[28] Int Univ Hlth & Welf Hosp, Dept Neurol, Nasushiobara, Tochigi 3292763, Japan
[29] Ako City Hosp, Dept Gastroenterol, Ako, Hyogo 6780232, Japan
[30] Kameda Med Ctr, Dept HomeCareMed, Kamogawa, Chiba 2928601, Japan
[31] Fujiyoshida Municipal Hosp, Dept Surg, Fujiyoshida, Yamanashi 4030005, Japan
[32] Nara Prefectural Gojo Hosp, Dept Internal Med, Gojo, Nara 6378511, Japan
[33] Natl Hosp Org, Beppu Med Ctr, Dept Surg, Beppu, Oita 8740011, Japan
[34] Jomoto Gastroenter & Internal Med Clin, Kumamoto, Kumamoto 8620976, Japan
[35] Higashi Washinomiya Hosp, Dept Cardiol & Vasc Surg, Kuki, Saitama 3400203, Japan
[36] Osaka City Gen Hosp, Dept Surg Gastroenterol, Miyakojima Ku, Osaka, Osaka 5340021, Japan
[37] Nishimino Kosei Hosp, Dept Internal Med, Gifu 5031394, Japan
[38] Ohtawara Red Cross Hosp, Dept Surg, Ohtawara, Tochigi 3248686, Japan
[39] Kohka Publ Hosp, Dept Internal Med, Kohka, Shiga 5280014, Japan
[40] Naganuma Municipal Hosp, Dept Gastroenterol, Yubari Gun, Hokkaido 0691332, Japan
[41] Murakami Mem Hosp, Dept Internal Med, Saijo, Ehime 7930030, Japan
[42] Iwate Prefectural Cent Hosp, Endoscopy Unit, Morioka, Iwate 0200066, Japan
[43] Sapporo Higashi Tokushukai Hosp, Ctr Gastroenterol, Higashi Ku, Sapporo, Hokkaido 0650033, Japan
[44] Matsue Seikyo Gen Hosp, Internal Med, Matsue, Shimane 6908522, Japan
[45] Sendai Kousei Hosp, Digest Endoscopy Ctr, Sendai, Miyagi 9800873, Japan
[46] Akita City Hosp, Dept Gastroenterol, Akita, Akita 0100933, Japan
[47] Kure Kyosai Hosp, Dept Surg, Kure, Hiroshima 7378505, Japan
[48] Japan Red Cross Date Gen Hosp, Dept Gastroenterol, Date, Hokkaido 0528511, Japan
[49] Tsuchida Hosp, Dept Surg, Sapporo, Hokkaido 0640921, Japan
[50] Hirano Gen Hosp, Dept Gastroenterol, Gifu, Gifu 5011192, Japan