Liu, D T Chorion villi for first trimester prenatal diagnosis. [electronic resource] - Asia-Oceania journal of obstetrics and gynaecology Sep 1986 - 451-5 p. digital Publication Type: Journal Article ISSN: 0389-2328 Standard No.: 10.1111/j.1447-0756.1986.tb00217.x doi Subjects--Topical Terms: BiopsyChorionic Villi--pathologyFemaleHumansPregnancyPregnancy Trimester, FirstPrenatal Diagnosis