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Tan, Xueying; Hu, Jingbo . (2015). Combination therapy for type 2 diabetes: dapagliflozin plus metformin. Expert Opinion on Pharmacotherapy, (), 14656566.2016.1121235–. doi:10.1517/14656566.2016.1121235 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research