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Slash also made several contributions to " The Heroin Diaries : A Year in the Life of a Shattered Rock Star " , the autobiography of Mötley Crüe bassist and back-up singer Nikki Sixx , which was also published in 2007 .
 Slash, Mötley Crüe, Nikki Sixx
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Slash, Mötley Crüe, Nikki Sixx