*Hisaaki Nishimura1, Nobutoshi Nawa1, Takahisa Ogawa2, Kiyohide Fushimi3, Takeo Fujiwara1
(1. Tokyo Medical and Dental University Department of Public Health, 2. Tokyo Medical and Dental University Department of Orthopaedics, 3. Tokyo Medical and Dental University Department of Health Policy and Informatics)
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