RT Journal Article SR Electronic T1 An Unfounded Conclusion from a Confounded Study JF The Journal of the American Board of Family Medicine JO J Am Board Fam Med FD American Board of Family Medicine SP 420 OP 420 DO 10.3122/jabfm.2007.04.070061 VO 20 IS 4 A1 Rupp, Tracy L. A1 Balkin, Thomas J. YR 2007 UL http://www.jabfm.org/content/20/4/420.2.abstract AB