Affiliation: | 1. Second Department of Surgery, Osaka University Medical School, Fukushima-ku, 553, Osaka, Japan 2. Department of Medicine and Geriatrics, Osaka University Medical School, Fukushima-ku, 553, Osaka, Japan 3. Chromosome Research Unit, Faculty of Science, Hokkaido University, 060, Sapporo, Japan 4. Department of Cytogenetics, Medical Research Institute, Tokyo Medical and Dental University, Bunkyo-ku, 113, Tokyo, Japan
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