Drupal-Bibcite0<style face="normal" font="default" size="100%">Effectiveness of a multifactorial intervention on preventing development of frailty in pre-frail older people: study protocol for a randomised controlled trial</style><style face="normal" font="default" size="100%">Effectiveness of a multifactorial intervention on preventing development of frailty in pre-frail older people: study protocol for a randomised controlled trial</style>