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U.S. envoy John Kornblum met Serbian President Slobodan Milosevic on Thursday in an effort to defuse a growing crisis surrounding Bosnia 's post-war elections .
 John Kornblum, U.S., Bosnia, Slobodan Milosevic, Serbian
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, else, organization, person 
Text: {0} 
Answer:
 John Kornblum, U.S., Bosnia, Slobodan Milosevic, Serbian