RT Journal Article SR Electronic T1 Phase IV Drug Studies JF The Journal of the American Board of Family Practice JO J Am Board Fam Med FD American Board of Family Medicine SP 115 OP 115 DO 10.3122/jabfm.5.1.115 VO 5 IS 1 A1 Ellsworth, Allan YR 1992 UL http://www.jabfm.org/content/5/1/115.abstract AB