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Sawhney, M.; Salfiti, N.; Nelson, D.; Lederle, F.; Bond, J. . (2008). Risk factors for severe delayed postpolypectomy bleeding. Endoscopy, 40(2), 115–119. doi:10.1055/s-2007-966959 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research