An Electronic Practice-Based Network for Observational Comparative Effectiveness Research.Published in:Annals of Internal Medicine, 2009, v. 151, n. 5, p. 338, doi. 10.7326/0003-4819-151-5-200909010-00140By:Pace, Wilson D.;Cifuentes, Maribel;Valuck, Robert J.;Staton, Elizabeth W.;Brandt, Elias C.;West, David R.Publication type:Article