RT Journal Article SR Electronic T1 Measuring the Impact of Practice-based Research Networks (PBRNs) JF The Journal of the American Board of Family Medicine JO J Am Board Fam Med FD American Board of Family Medicine SP 557 OP 559 DO 10.3122/jabfm.2012.05.120176 VO 25 IS 5 A1 Werner, James J. YR 2012 UL http://www.jabfm.org/content/25/5/557.abstract AB