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Beat writer William S. Burroughs read a paper by Richard Evans Schultes on the subject and while traveling through South America in the early 1950 s sought out ayahuasca in the hopes that it could relieve or cure opiate addiction ( see " The Yage Letters " ) .
 William S. Burroughs, Richard Evans Schultes, South America
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 William S. Burroughs, Richard Evans Schultes, South America