Endeshaw YW, Unruh ML, Kutner M, Newman AB, Bliwise DL. Sleep-disordered breathing and frailty in the Cardiovascular Health Study Cohort. Am J Epidemiol. 2009  ;170(2):193-202.

Whitson HE, Thielke S, Diehr P, O'Hare AM, Chaves PHM, Zakai NA, Arnold A, Chaudhry S, Ives D, Newman AB. Patterns and predictors of recovery from exhaustion in older adults: the cardiovascular health study. J Am Geriatr Soc. 2011  ;59(2):207-13.