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Walmsley, Sarah; Osmotherly, Peter G.; Walker, Colin J.; Rivett, Darren A. . (2013). Power Doppler Ultrasonography in the Early Diagnosis of Primary/Idiopathic Adhesive Capsulitis: An Exploratory Study. Journal of Manipulative and Physiological Therapeutics, 36(7), 428–435. doi:10.1016/j.jmpt.2013.05.024 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research