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Preeclampsia is a disorder characterized mainly by hypertension and proteinuria after 20 weeks of gestation. It is a leading cause of maternal and perinatal morbidity and mortality in both developed and developing countries. For example, in Canada, preeclampsia accounts for one-third of maternal deaths during pregnancy and this trend has not changed since the 1970s. Its etiology and pathogenesis are unclear. No effective treatment is available, except early delivery (This results in a significant increased number of preterm deliveries in mothers with preeclampsia). No effective prevention is available.