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Sussman, Walter I; Jerome, Mairin A; Foster, Lisa . (2019). Platelet-rich plasma for the treatment of coccydynia: a case report and review of regenerative medicine for coccydynia. Regenerative Medicine, 14(12), 1151–1154. doi:10.2217/rme-2019-0102 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research