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2. Causes of maternal mortality in the United States;Kaunitz;Obstet Gynecol,1985
3. British births 1970: Vol 2. Obstetric care;Chamberlain,1978
4. Pre-eclampsia: the hypertensive disease of pregnancy;MacGillivray,1983
5. Snoring, hypertension, and the sleep apnea syndrome: an epidemiologic survey of middle-aged women;Gislason;Chest,1993