Observational comparative effectiveness studies of drug therapies: high-quality answers or important clinical questions?: comment on "Comparative effectiveness of 2 β-blockers in hypertensive patients".
作者信息
Floyd James S, Psaty Bruce M
机构信息
Cardiovascular Health Research Unit, University of Washington, Seattle, 98101, USA.
出版信息
Arch Intern Med. 2012 Oct 8;172(18):1412-14. doi: 10.1001/archinternmed.2012.4306.