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J Gerontol A Biol Sci Med Sci. 2020; 75: 1763\u20131770.","DOI":"10.1093\/gerona\/glaa046"},{"key":"28","doi-asserted-by":"crossref","unstructured":"28) Dunlop DD, Song J, <i>et al<\/i>.: Relation of physical activity time to incident disability in community dwelling adults with or at risk of knee arthritis: prospective cohort study. BMJ. 2014; 348: g2472.","DOI":"10.1136\/bmj.g2472"},{"key":"29","doi-asserted-by":"crossref","unstructured":"29) Makino K, Lee S, <i>et al<\/i>.: Daily physical activity and functional disability incidence in community-dwelling older adults with chronic pain: a prospective cohort study. Pain Med. 2019; 20: 1702\u20131710.","DOI":"10.1093\/pm\/pny263"},{"key":"30","doi-asserted-by":"crossref","unstructured":"30) Jansen FM, Prins RG, <i>et al<\/i>.: Physical activity in non-frail and frail older adults. 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