APA

Chitayat D., Farrell S. A., Huang T., Meier C., Wyatt P. R. & Summers A. M. (20021018). Double-positive maternal serum screening results for down syndrome and open neural tube defects: An indicator for fetal structural or chromosomal abnormalities and adverse obstetric outcomes. : American journal of obstetrics and gynecology.

Chicago

Chitayat David, Farrell Sandra A, Huang Tianhua, Meier Chris, Wyatt Philip R and Summers Anne M. 20021018. Double-positive maternal serum screening results for down syndrome and open neural tube defects: An indicator for fetal structural or chromosomal abnormalities and adverse obstetric outcomes. : American journal of obstetrics and gynecology.

Harvard

Chitayat D., Farrell S. A., Huang T., Meier C., Wyatt P. R. and Summers A. M. (20021018). Double-positive maternal serum screening results for down syndrome and open neural tube defects: An indicator for fetal structural or chromosomal abnormalities and adverse obstetric outcomes. : American journal of obstetrics and gynecology.

MLA

Chitayat David, Farrell Sandra A, Huang Tianhua, Meier Chris, Wyatt Philip R and Summers Anne M. Double-positive maternal serum screening results for down syndrome and open neural tube defects: An indicator for fetal structural or chromosomal abnormalities and adverse obstetric outcomes. : American journal of obstetrics and gynecology. 20021018.