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Christopher Stevens; Justin K.P. Lee; Mohsen Sadatsafavi; Geoffrey K. Blair. (2009). Pediatric thyroid fine-needle aspiration cytology: a meta-analysis. , 44(11), 0–2191. doi:10.1016/j.jpedsurg.2009.07.022 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research