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He received a Ph. D in Mechanical and Production Engineering from the Nanyang Technological University , Singapore , in 1997 and a Ph. D in Turbomachinery from the University of Wisconsin , Milwaukee , in 2000 .
 Mechanical, Nanyang Technological University, Singapore, University of Wisconsin, Milwaukee
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Mechanical, Nanyang Technological University, Singapore, University of Wisconsin, Milwaukee