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Vetvik, Kjersti Grøtta; MacGregor, E Anne . (2016). Sex differences in the epidemiology, clinical features, and pathophysiology of migraine. The Lancet Neurology, (), S1474442216302939–. doi:10.1016/S1474-4422(16)30293-9 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research