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He wrote his DPhil thesis Application of Evolutionary Computation to Constraint Satisfaction and Data Mining under the supervision of Joost N. Kok , Thomas Bäck and Ágoston E. Eiben at Leiden University , defending his thesis on 28 November 2002 .
 Leiden University
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Leiden University