RT Journal Article SR Electronic T1 Can patients with COPD or asthma take a beta-blocker JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 498 OP 499 DO 10.3949/ccjm.77a.09133 VO 77 IS 8 A1 Elsy Viviana Navas A1 David O. Taylor YR 2010 UL http://www.ccjm.org/content/77/8/498.abstract AB