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Martial arts Stephan Bonnar and Josh Barnett , mixed martial arts ( MMA ) fighters from the UFC and PRIDE Fighting Championships , have also tested positive for the banned substance .
 Stephan Bonnar, Josh Barnett, UFC, PRIDE Fighting Championships
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Stephan Bonnar, Josh Barnett, UFC, PRIDE Fighting Championships