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DESCRIBE <http://research.tib.eu/covid-19/entity/How%20many%20times%20have%20you%20had%20to%20take%20nitroglycerin%20%28nitroglycerin%20tablets%20or%20spray%29%20for%20your%20chest%20pain%2C%20chest%20tightness%20or%20angina%20on%20average%20over%20the%20past%204w>
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