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Alireza Shokoohi is an Iranian hydrologist , university associate professor at Imam Khomeini International University and guest researcher at the University of Oklahoma .
 Imam Khomeini International University, University of Oklahoma
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Imam Khomeini International University, University of Oklahoma