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 221 OP 222 DO 10.3122/jabfm.2.3.221b VO 2 IS 3 YR 1989 UL http://www.jabfm.org/content/2/3/221.2.abstract AB