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The need for a Pan American Association of Anatomy was proposed by Prof. Di Dio in the 74th meeting of the American Association of Anatomy held in Chicago , USA , in March 1961 .
 Pan, Anatomy, Anatomy, Chicago
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Pan, Anatomy, Anatomy, Chicago