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Stuart J. Head; David R. Holmes Jr; Michael J. Mack; Patrick W. Serruys; Friedrich W. Mohr; Marie-Claude Morice; Antonio Colombo; A. Pieter Kappetein. (2012). Risk Profile and 3-Year Outcomes From the SYNTAX Percutaneous Coronary Intervention and Coronary Artery Bypass Grafting Nested Registries. , 5(6), –. doi:10.1016/j.jcin.2012.02.013 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research