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Barrera, Christian A.; Cohen, Sara A.; Sankar, Wudbhav N.; Ho-Fung, Victor M.; Sze, Raymond W.; Nguyen, Jie C. . (2019). Imaging of developmental dysplasia of the hip: ultrasound, radiography and magnetic resonance imaging. Pediatric Radiology, 49(12), 1652–1668. doi:10.1007/s00247-019-04504-3 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research