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Yanyan Zhu; Bhavik J. Pandya; Hyon K. Choi. (2011). Prevalence of gout and hyperuricemia in the US general population: The National Health and Nutrition Examination Survey 2007–2008. , 63(10), 3136–3141. doi:10.1002/art.30520 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research