Affiliation: | Department of Orthopaedic Surgery, Tokyo Medical College Kasumigaura Hospital, 3-20-1 Ami Chuo, Inashiki-gun, Ibaraki 300-03, Japan, JP Department of Orthopaedic Surgery, Tokyo Medical College, 6-1-1 Shinjuku, Shinjuku-ku, Tokyo 160, Japan, JP
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