1. Pre-eclampsia;Walker;Lancet,2000
2. Pregnancy-related mortality surveillance-United States, 1987-1990;Koonin;Mor Mortal Wkly Rep CDC Surveill Summ,1997
3. ACOG Practice Bulletin No. 29. American College of Obstetricians and Gynecologists;Chronic hypertension in pregnancy;Obstet Gynecol,2001
4. Report of the National High Blood Pressure Education Program Working Group on High Blood Pressure in Pregnancy;Am J Obstet Gynecol,2000
5. Does gestational hypertension become pre-eclampsia?;Saudan;Br J Obstet Gynaecol,1998