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He then joined the London School of Hygiene and Tropical Medicine , and took the DM in 1913 with a dissertation on the tsetse fly ( Glossina palpalis ) and sleeping sickness .
 Hygiene, Tropical Medicine
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Hygiene, Tropical Medicine