AU  - Floyd JS, Psaty BM
TI  - 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”
PT  - JOUR
DP  - 2012
TA  - Archives of Internal Medicine
pages = {1412-1414},
VI  - 172
IP  - 18
AID  - 10.1001/archinternmed.2012.4306 [doi]
4100  - http://dx.doi.org/10.1001/archinternmed.2012.4306
SO  - Archives of Internal Medicine October 8, 2012 172(18):1412