Ferretti-Rebustini, R.E. de L. et al. 2015. Validity of the Katz Index to assess activities of daily living by informants in neuropathological studies . Revista da Escola de Enfermagem da USP. 49, 6 (Dec. 2015), 944–950. DOI:https://doi.org/10.1590/S0080-623420150000600010.