Martins, G. S.; Galvão, L. L.; Tribess, S.; Meneguci, J.; Virtuoso Júnior, J. S. Isotemporal Substitution of Sleep or Sedentary Behavior With Physical Activity in the Context of Frailty Among Older Adults: A Cross-Sectional Study. Sao Paulo Med J 2023, 141, 12-19.