Studies of illness in the aged. The Index of ADL: A standardized measure of biological and psychological function. Katz, S., Ford, A. B., Moskowitz, R. W., Jackson, B. A., Jaffe, M. W., & Cleveland, M. A. Journal of the American Medical Association, 185:914–919, 1963.
bibtex   
@article{katz_studies_1963,
	title = {Studies of illness in the aged. {The} {Index} of {ADL}:  {A} standardized measure of biological and psychological function},
	volume = {185},
	journal = {Journal of the American Medical Association},
	author = {Katz, S. and Ford, A. B. and Moskowitz, R. W. and Jackson, B. A. and Jaffe, M. W. and Cleveland, M. A.},
	year = {1963},
	pages = {914--919},
}

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