RT Journal Article SR Electronic T1 Books Received JF The Journal of the American Board of Family Practice JO J Am Board Fam Med FD American Board of Family Medicine SP 539 OP 540 DO 10.3122/jabfm.7.6.539 VO 7 IS 6 YR 1994 UL http://www.jabfm.org/content/7/6/539.abstract AB