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In 1910 he abruptly left for the German University of Marburg , where he studied under Neo-Kantian philosophers Hermann Cohen , Nicolai Hartmann and Paul Natorp .
 German, University of Marburg, Neo-Kantian, Hermann Cohen, Nicolai Hartmann, Paul Natorp
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 German, University of Marburg, Neo-Kantian, Hermann Cohen, Nicolai Hartmann, Paul Natorp