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Georgios Diamantidis ( ; born January 3 , 1984 in Katerini , Central Macedonia ) is a retired Greek swimmer , who specialized in long-distance freestyle events .
 Katerini, Central Macedonia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Katerini, Central Macedonia