RT Journal Article SR Electronic T1 Manual of Clinical Problems in Obstetrics and Gynecology with Annotated Key References JF The Journal of the American Board of Family Practice JO J Am Board Fam Med FD American Board of Family Medicine SP 120 OP 120 DO 10.3122/jabfm.5.1.120 VO 5 IS 1 A1 Thomas Norris YR 1992 UL http://www.jabfm.org/content/5/1/120.1.abstract AB