RT @S_Rabinovitch: Top medical study on heart attacks in marathons: 1:185,000 runners http://www.nejm.org/doi/full/10.1056/NEJMoa1106468
Beijing Marathon: 1:5000 http://www.scmp.com/news/china/society/article/1859890/six-runners-and-race-official-suffer-heart-attacks-during-beijing
