Shlipak MG, Stehman-Breen C, Fried LF, Song X, Siscovick D, Fried LP, Psaty BM, Newman AB. The presence of frailty in elderly persons with chronic renal insufficiency. Am J Kidney Dis. 2004  ;43(5):861-7.

Cai L, Schenker N, Lubitz J, Diehr P, Arnold A, Fried LP. Evaluation of a method for fitting a semi-Markov process model in the presence of left-censored spells using the Cardiovascular Health Study. Stat Med. 2008  ;27(26):5509-24.

Newman AB, Arnold AM, Sachs MC, Ives DG, Cushman M, Strotmeyer ES, Ding J, Kritchevsky SB, Chaves PHM, Fried LP, et al. Long-term function in an older cohort--the cardiovascular health study all stars study. J Am Geriatr Soc. 2009  ;57(3):432-40.

Eckel SP, Bandeen-Roche K, Chaves PHM, Fried LP, Louis TA. Surrogate screening models for the low physical activity criterion of frailty. Aging Clin Exp Res. 2011  ;23(3):209-16.