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The Congress is held annually and next edition will take place on October 6-10 , 2013 in Washington , D.C. More than 100 panel sessions , will cover a wide range of multispecialty topics of interest to Surgeon .
 Washington , D.C.
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Washington , D.C.