APA

Thilaganathan B., Slack A. & Wathen N. C. (19971223). Effect of first-trimester nuchal translucency on second-trimester maternal serum biochemical screening for Down's syndrome. : Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology.

Chicago

Thilaganathan B, Slack A and Wathen N C. 19971223. Effect of first-trimester nuchal translucency on second-trimester maternal serum biochemical screening for Down's syndrome. : Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology.

Harvard

Thilaganathan B., Slack A. and Wathen N. C. (19971223). Effect of first-trimester nuchal translucency on second-trimester maternal serum biochemical screening for Down's syndrome. : Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology.

MLA

Thilaganathan B, Slack A and Wathen N C. Effect of first-trimester nuchal translucency on second-trimester maternal serum biochemical screening for Down's syndrome. : Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology. 19971223.