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In 2000 , he received his doctorate in Ancient History from the University of Heidelberg , Germany for a dissertation titled " Apuleius und die Räuber .
 University of Heidelberg, Apuleius
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 University of Heidelberg, Apuleius