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Mazza, Mario G.; Rossetti, Aurora; Crespi, Giovanna; Clerici, Massimo . (2019). Prevalence of co‐occurring psychiatric disorders in adults and adolescents with intellectual disability: A systematic review and meta‐analysis. Journal of Applied Research in Intellectual Disabilities, (), jar.12654–. doi:10.1111/jar.12654 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research