APA

Timmerman E., Clur S. A., Pajkrt E. & Bilardo C. M. (20110411). First-trimester measurement of the ductus venosus pulsatility index and the prediction of congenital heart defects. : Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology.

Chicago

Timmerman E, Clur S A, Pajkrt E and Bilardo C M. 20110411. First-trimester measurement of the ductus venosus pulsatility index and the prediction of congenital heart defects. : Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology.

Harvard

Timmerman E., Clur S. A., Pajkrt E. and Bilardo C. M. (20110411). First-trimester measurement of the ductus venosus pulsatility index and the prediction of congenital heart defects. : Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology.

MLA

Timmerman E, Clur S A, Pajkrt E and Bilardo C M. First-trimester measurement of the ductus venosus pulsatility index and the prediction of congenital heart defects. : Ultrasound in obstetrics & gynecology : the official journal of the International Society of Ultrasound in Obstetrics and Gynecology. 20110411.