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Kim Hyun-Joo ( also Kim Hyeon-Ju , ; born January 2 , 1986 ) is a retired South Korean swimmer , who specialized in freestyle events .
 Kim Hyun-Joo, Kim
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kim Hyun-Joo, Kim