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Tianhua Huang; Barry Hoffman; Wendy Meschino; John Kingdom; Nanette Okun. (2010). Prediction of adverse pregnancy outcomes by combinations of first and second trimester biochemistry markers used in the routine prenatal screening of Down syndrome. , 30(5), 0–0. doi:10.1002/pd.2505 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research