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Perls T.T, Morris J.N, Ooi W.L, Lipsitz L.A.  1993.  The relationship between age, gender and cognitive performance in the very old: the effect of selective survival. Journal of the American Geriatrics Society. 41(11):1193-201.

Won A., Lapane K., Gambassi G., Bernabei R., Mor V., Lipsitz L.A.  1999.  Correlates and management of nonmalignant pain in the nursing home. SAGE Study Group. Systematic Assessment of Geriatric drug use via Epidemiology. J Am Geriatr Soc. 47(8):936-42.