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web.archive.org
"What Is Pericarditis?". National Heart, Lung, and Blood Institute. September 26, 2012. Archived from the original on October 2, 2016.
"What Causes Pericarditis?". National Heart, Lung, and Blood Institute. September 26, 2012. Archived from the original on 2 October 2016. Retrieved 28 September 2016.