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Statistics Bureau, Ministry of            Internal Affairs and Communications of Japan. Population of the elderly.            2022. https:\/\/www.stat.go.jp\/data\/topics\/topi1321.html (in            Japanese)."},{"key":"2","unstructured":"2. Ministry of Health, Labour and            Welfare of Japan. Health lifespan extension plan. 2019.            https:\/\/www.mhlw.go.jp\/content\/12601000\/000514142.pdf (in            Japanese)."},{"key":"3","unstructured":"3. Sarcopenia Diagnosis and Treatment            Guidelines Committee. Sarcopenia diagnosis and treatment guideline 2017          edition: Partially revised version. Japan Geriatrics Society, 2020.            (in Japanese)."},{"key":"4","doi-asserted-by":"crossref","unstructured":"4. Kitamura              A, Seino              S, Abe              T, et al.            Sarcopenia: prevalence, associated factors, and the risk of mortality and            disability in Japanese older adults. 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Jpn J Compr Rehabil Sci          2018; 9: 66\u201372.","DOI":"10.11336\/jjcrs.9.66"},{"key":"20","unstructured":"20. Nakayama              S, Fukumoto              Y, Kotake              T. Eds. Easy-to-understand          musculoskeletal ultrasound for rehabilitation: functional anatomy and assessment          techniques useful for exercise therapy. Medical View, Tokyo,          2019."},{"key":"21","doi-asserted-by":"crossref","unstructured":"21. Fukumoto              Y, Ikezoe              T, Yamada              Y, et al.            Age-related ultrasound changes in muscle quantity and quality in            women. Ultrasound Med Biol          2015; 41: 3013\u20133017.","DOI":"10.1016\/j.ultrasmedbio.2015.06.017"},{"key":"22","doi-asserted-by":"crossref","unstructured":"22. Tabata              H, Otsuka              H, Shi              H, et al.            Effects of exercise habits in adolescence and older age on sarcopenia            risk in older adults: the Bunkyo Health Study. 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