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He will hold talks , probably behind closed doors , with President Vojislav Kostunica , but the United States is keeping a low profile because there is quite a lot of anti-American sentiment on the streets here in Serbia .
 Vojislav Kostunica, the United States, anti-American, Serbia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 Vojislav Kostunica, the United States, anti-American, Serbia