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He studied at Kiel and Göttingen , and in 1846 became Bernhard Rudolf Konrad von Langenbeck 's assistant at the Kiel surgical hospital .
 Kiel, Bernhard Rudolf Konrad von Langenbeck, Kiel
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Kiel, Bernhard Rudolf Konrad von Langenbeck, Kiel