Prevalence of Frailty in Brazilian Older Adults: A Systematic Review and Meta-Analysis - Melo, Ruth Caldeira de; Cipolli, Gabriela Cabett; Buarque, Giselle Layse Andrade; Yassuda, Monica Sanches; Cesari, M; Oude Voshaar, Richard C; Aprahamian, Ivan (Journal of Nutrition, Health and Aging, 2020)