RT Journal Article SR Electronic T1 Factor V Leiden Mutation and Pregnancy JF The Journal of the American Board of Family Practice JO J Am Board Fam Med FD American Board of Family Medicine SP 306 OP 308 DO 10.3122/jabfm.17.4.306 VO 17 IS 4 A1 Robert C. Langan YR 2004 UL http://www.jabfm.org/content/17/4/306.abstract AB