RT Journal Article SR Electronic T1 Prenatal Testing and Counseling for Down Syndrome JF The Journal of the American Board of Family Practice JO J Am Board Fam Med FD American Board of Family Medicine SP 227 OP 228 DO 10.3122/15572625-13-3-227b VO 13 IS 3 A1 Klein, Jeremy YR 2000 UL http://www.jabfm.org/content/13/3/227.2.abstract AB