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Through a collaboration between the University of Ottawa and the Belize Indigenous Training Institute , six Mayan healers , practicing traditional medicine in Belize , were interviewed and they reported that Souroubea plants are safe , with no adverse effects .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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