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V. Lukashevich; A. Schweizer; Q. Shao; P.-H. Groop; W. Kothny. (2011). Safety and efficacy of vildagliptin versus placebo in patients with type 2 diabetes and moderate or severe renal impairment: a prospective 24-week randomized placebo-controlled trial. , 13(10), 947–954. doi:10.1111/j.1463-1326.2011.01467.x 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research