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Cibulka, Michael T.; Bloom, Nancy J.; Enseki, Keelan R.; Macdonald, Cameron W.; Woehrle, Judith; McDonough, Christine M. . (2017). Hip Pain and Mobility Deficits—Hip Osteoarthritis: Revision 2017. Journal of Orthopaedic & Sports Physical Therapy, 47(6), A1–A37. doi:10.2519/jospt.2017.0301 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research