Helmerhorst F M, Rosendaal F R, Vandenbroucke J P
Department of Obstetrics, Gynaecology and Reproductive Medicine, Hemostasis and Thrombosis Research Center, Leiden University Medical Center, The Netherlands.
Hum Reprod. 1998 Nov;13(11):2981-3. doi: 10.1093/humrep/13.11.2981.