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In 1884 he received his doctorate at the University of Strasbourg , afterwards working as an assistant at the University of Rostock ( from 1885 ) .
 University of Strasbourg, University of Rostock
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 Strasbourg, University of Rostock