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Gustavo Andrade de Paulo; José Celso Ardengh; Frank Shigueo Nakao; Angelo Paulo Ferrari. (2006). Treatment of esophageal varices: a randomized controlled trial comparing endoscopic sclerotherapy and EUS-guided sclerotherapy of esophageal collateral veins. , 63(3), 396–402. doi:10.1016/j.gie.2005.10.039 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research