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Together with Nelson Mandela , the Nelson Mandela Foundation and the South African Medical Association ( SAMA ) , he established Tshepang Trust , which facilitates the treatment of HIV positive patients .
 Nelson Mandela, Nelson Mandela, Medical
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Nelson Mandela, Nelson Mandela, Medical