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Tsuguo Shikata
Kyoto Prefectural Univercity of Medicine, Dept. of Surgery
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Yoshihiro Nakane
Kyoto Prefectural Univercity of Medicine, Department of Surgery
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Isamu Hashimoto
Kyoto Prefectural Univercity of Medicine, Department of Surgery
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W.J. Dempster
Royal postgraduate Medical School of London Submitted for publication