Smith NL, Chan JD, Rea TD, Wiggins KL, Gottdiener JS, Lumley T, Psaty BM. Time trends in the use of beta-blockers and other pharmacotherapies in older adults with congestive heart failure. Am Heart J. 2004  ;148(4):710-7.

Chan JD, Rea TD, Smith NL, Siscovick D, Heckbert SR, Lumley T, Chaves P, Furberg CD, Kuller L, Psaty BM. Association of beta-blocker use with mortality among patients with congestive heart failure in the Cardiovascular Health Study (CHS). Am Heart J. 2005  ;150(3):464-70.