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Academic education and professional positions Heidbrink studied Social and Economic History at the University of Hamburg ( Germany ) , where he got his M.A. in 1994 and his Dr. phil .
 Heidbrink, University of Hamburg
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Heidbrink, University of Hamburg