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During the production of the album , the band encountered hindrances such as singer Eddie Vedder 's writer 's block , and guitarist Mike McCready 's entrance into rehabilitation due to an addiction to prescription drugs .
 Eddie Vedder, Mike McCready
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Eddie Vedder, Mike McCready