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A 2014 review in " Nature Reviews Cancer " found that " contrary to the claimed mechanism of redirecting the flow of " qi " through meridians , researchers usually find that it generally does not matter where the needles are inserted , how often ( that is , no dose-response effect is observed ) , or even if needles are actually inserted .
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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:
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