1. Pregnancy-related mortality surveillance – United States, 1987–1990;Koonin;MMWR CDC Surveill Summ,1997
2. Thrombosis in pregnancy: maternal and fetal issues;Greer;Lancet,1999
3. Venous thrombosis during pregnancy: leg and trimester of presentation;Ginsberg;Thromb Haemost,1992
4. Risk factors for venous thrombotic disease;Rosendaal;Thromb Haemost,1999
5. Deep vein thrombosis;Kyrle;Lancet,2005