RT Journal Article SR Electronic T1 Measures Of Clinical Effectiveness: The Numbers Needed To Treat JF The Journal of the American Board of Family Practice JO J Am Board Fam Med FD American Board of Family Medicine SP 469 OP 472 DO 10.3122/jabfm.4.6.469 VO 4 IS 6 A1 Neighbor, William E. YR 1991 UL http://www.jabfm.org/content/4/6/469.abstract AB