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Specific events and activities sponsored by the club have included the 2011 regional conference " Proactivity " , held in Zagreb from 15 April to 17 April 2011 under the auspices of the President of the Republic of Croatia , dr. sc .
 Zagreb, dr. sc .
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Zagreb, dr. sc .