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He performed investigations on the use of Jauregg 's malaria therapy for treatment of syphilis in its early stages , and with Dr. Weichselbaum , he performed important studies involving the origin and development of the islets of Langerhans in the fetus .
 Jauregg 's, Weichselbaum
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Jauregg 's, Weichselbaum