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A 2011 meta-analysis in the Journal of the American Medical Association found that each additional hour of sexual activity per week resulted in an increased risk of 2-3 myocardial infarctions and one sudden cardiac death per 10,000 person-years .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None