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He studied medicine at the University of Graz , and afterwards was an assistant to Anton Weichselbaum ( 1845-1920 ) at the clinic of pathological anatomy at the University of Vienna .
 University of Graz, Anton Weichselbaum, University of Vienna
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 Graz, Anton Weichselbaum, University of Vienna