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He studied the medium Leonore Piper , and collaborating with French chemist and psychical researcher René Warcollier in a transatlantic telepathy experiment .
 Leonore Piper, René Warcollier
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Leonore Piper, René Warcollier