Cardonick E H, Kuhlman K, Ganz E, Pagotto L T
Department of Obstetrics and Gynecology, Thomas Jefferson Medical College, Phila, PA 19107-5083, USA.
Prenat Diagn. 1997 Oct;17(10):983-8. doi: 10.1002/(sici)1097-0223(199710)17:10<983::aid-pd174>3.0.co;2-0.