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Mao, Yi; Zheng, Yong; Li, Yang; Wang, Guodong; Sun, Jianmin; Cui, Xingang . (2019). Factors Associated with Perioperative Serum Calcium Levels in Percutaneous Kyphoplasty for Osteoporotic Vertebral Compression Fracture: A Prospective Clinical Study. Medical Science Monitor, 25(), 1800–1805. doi:10.12659/MSM.913297 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research