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He was diagnosed with brain cancer in the fall of 2011 and has ever since concentrated solely on his own career , including the 2012 albums A Part of You and Midnight Garden , the latter being a collaboration with his friend Brad Roberts of the Crash Test Dummies .
 Brad Roberts
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Brad Roberts