Affiliation: | 1. Department of Pathology, Hokkaido University School of Medicine, Kita 14 Nishi 5, Kita-ku, 060, Sapporo, Japan 2. Chromosome Research Unit, Faculty of Science, Hokkaido University, Sapporo, Japan 3. Department of Orthopaedic Surgery, Hokkaido University School of Medicine, Sapporo, Japan
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