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Pan, Kristen S; Heiss, John D; Brown, Sydney M; Collins, Michael T; Boyce, Alison M . (2018). Chiari I Malformation and Basilar Invagination in Fibrous Dysplasia: Prevalence, Mechanisms, and Clinical Implications. Journal of Bone and Mineral Research, 33(11), 1990–1998. doi:10.1002/jbmr.3531 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research