1. Rochat RW et al (1988) Maternal mortality in the United States: report from the Maternal Mortality Collaborative. Obstet Gynecol 72: 91–97
2. Franks AL et al (1990) Obstetrical pulmonary embolism mortality, United States, 1970–1985. Am J Public Health 80: 720–722
3. Bergquist A, Bergquist D, Halbook T (1983) Acute deep vein thrombosis (DVT) after cesarean section. Acta Obstet Gynecol (Scand) 62: 473–477
4. Rutherford SE et al (1991) Thromboembolic disease associated with pregnency: an 11-year review. Am J Obstet Gynecol 164: 286
5. Barbour LA, Pickard J (1995) Controversies in thromboembolic disease during pregnancy: a critical review. Obstet Gynecol 86: 621–633