<style face="normal" font="default" size="100%">A randomized trial of quadriceps resistance exercise and vitamin D in frail older people: The Frailty Interventions Trial in Elderly Subjects (FITNESS)</style>

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0<style face="normal" font="default" size="100%">A randomized trial of quadriceps resistance exercise and vitamin D in frail older people: The Frailty Interventions Trial in Elderly Subjects (FITNESS)</style>