Department of Gastroenterology;
University of Tokyo;
7-3-1 Hongo;
Bunkyo-ku;
Tokyo 113-8655;
Japan;
Department of Gastroenterology;
Toshiba General Hospital;
6-3-22 Higashiooi;
Shinagawa-ku;
Tokyo 140-8522;
Japan;
Yokohama Rosai Hospital;
3211 Kozukue-cho;
Kouhoku-ku;
Yokohama-shi;
Kanagawa 222-0036;
Japan;