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The Sirmium Legionaries is the oldest American football team in Serbia , founded in 2002 in Sremska Mitrovica .
 Serbia, Sremska Mitrovica
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Serbia, Sremska Mitrovica