Association of a Modified Physiologic Index with mortality and incident disability: the Health, Aging, and Body Composition study.
Sanders JL, Boudreau RM, Penninx BW, Simonsick EM, Kritchevsky SB, Satterfield S, Harris TB, Bauer DC, Newman AB. Association of a Modified Physiologic Index with mortality and incident disability: the Health, Aging, and Body Composition study. J Gerontol A Biol Sci Med Sci. 2012 Dec; 67(12):1439-46.