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He studied medicine in Berlin and Marburg , and from 1848 served as a prosector under Franz Ludwig Fick ( 1813-1858 ) and as an assistant to Carl Ludwig ( 1816-1895 ) in Marburg .
 Berlin, Marburg, Franz Ludwig Fick, Carl Ludwig, Marburg
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Berlin, Marburg, Franz Ludwig Fick, Carl Ludwig, Marburg