Affiliation: | 1. Department of Gastroenterology, Nagoya University Graduate School of Medicine, (65 Tsurumai-cho, Showa-ku), Nagoya City, Aichi, (466-8550), Japan 2. Department of Gastroenterology, Toyota Memorial Hospital, (1-1, Heiwa-cho), Toyota City, (471-8513), Japan 3. Department of Surgery, Toyota Memorial Hospital, (1-1, Heiwa-cho), Toyota City, (471-8513), Japan 4. Department of Pathology, Toyota Memorial Hospital, (1-1, Heiwa-cho), Toyota City, (471-8513), Japan
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