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Riki Kiriya, Etsuo Chosa, Takero Sakamoto, Shinji Watanabe, Osamu Kurosawa, Hideo Uchida, Kazunori Maeda, Shuji Kuroki, Naoya Tajima. "Acetabular Reinforcement Ring with Hook in Total Hip Arthroplasty for Rheumatoid Arthritis." Orthopedics & Traumatology 53.1 (2004) 111-115