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Christopher E Clark; Rod S Taylor; Angela C Shore; Obioha C Ukoumunne; John L Campbell. (2012). Association of a difference in systolic blood pressure between arms with vascular disease and mortality: a systematic review and meta-analysis. , 379(9819), 0–914. doi:10.1016/s0140-6736(11)61710-8 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research