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Bulloch, Rhodi E.; Lovell, Amy L.; Jordan, Vanessa M. B.; McCowan, Lesley M. E.; Thompson, John M. D.; Wall, Clare R. . (2018). Maternal folic acid supplementation for the prevention of preeclampsia: A systematic review and meta-analysis. Paediatric and Perinatal Epidemiology, (), –. doi:10.1111/ppe.12476 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research