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Teresa C. Horan; Robert P. Gaynes; William J. Martone; William R. Jarvis; T. Grace Emori. (1992). CDC definitions of nosocomial surgical site infections, 1992: A modification of CDC definitions of surgical wound infections. , 20(5), 271–274. doi:10.1016/s0196-6553(05)80201-9 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research