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He then enrolled at Uppsala University where he learned the profession of medical doctor from 1796 to 1801 ; Anders Gustaf Ekeberg , the discoverer of tantalum , taught him chemistry .
 Uppsala University, Anders Gustaf Ekeberg
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Uppsala University, Anders Gustaf Ekeberg