Affiliation: | 1. Division of Gastroenterol, Showa University Fujigaoka Hospital, 1-30 Fujigaoka, Midori-ku, 227, Yokohama, Japan 2. 2nd Dept. of Medicine, Kurume Medical College, Japan 3. 1st Dept. of Medicine, Okayama Univ., Japan 4. Japanese Red Cross Central Blood Center, Japan
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