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Mohlenkamp, S.; Lehmann, N.; Breuckmann, F.; Brocker-Preuss, M.; Nassenstein, K.; Halle, M.; Budde, T.; Mann, K.; Barkhausen, J.; Heusch, G.; Jockel, K.-H.; Erbel, R. . (2008). Running: the risk of coronary events : Prevalence and prognostic relevance of coronary atherosclerosis in marathon runners. European Heart Journal, 29(15), 1903–1910. doi:10.1093/eurheartj/ehn163 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research