Umeda Ikumi, Ohta Hidetoshi, Doi Tadashi, Nobuoka Atsushi, Kanisawa Yuji, Kawasaki Ryousuke, Iwai Kazuhiro
Hakodate Red Cross Hospital, Hakodate-city, Hokkaido, Japan.
Gastrointest Endosc. 2007 Oct;66(4):861-4. doi: 10.1016/j.gie.2007.02.003. Epub 2007 Aug 24.