Hill K, Thomas K, Aboulahr C, et al: Estimates of maternal mortality worldwide between 1990 and 2005: an assessment of available data. Lancet 2007; 370: 1311-1319.
Minakami H, Kohmura Y, Izumi A, et al: Relation between gestational thrombocytopenia and the syndrome of hemolysis, elevated liver enzymes, and low platelet count (HELLP syndrome). Gynecol Obstet Invest 1998; 46: 41-45.