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S. YamamotoMD 
            Department of Gastroenterology and Hepatology
Graduate School of Medicine
Kyoto University
            
            54 Shogoin Kawahara-cho
Sakyo-ku
Kyoto 606-8507
Japan
            
            Fax: +81-75-751-4303
            
            Email: shuyama@kuhp.kyoto-u.ac.jp