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He held postdoctoral appointments at Cambridge University , the Carnegie Institution of Washington , and Rutgers University before joining the faculty of the University of Maryland in 1998 .
 Cambridge University, Carnegie Institution of Washington, Rutgers University, University of Maryland
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Cambridge University, Carnegie Institution of Washington, Rutgers University, University of Maryland