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Additionally , many fans , commentators , and writers have blamed his tendency to overuse pitchers for damaging the careers of Robb Nen , Kerry Wood , Mark Prior , and Edinson Vólquez .
 Robb Nen, Kerry Wood, Mark Prior, Edinson Vólquez
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Robb Nen, Kerry Wood, Mark Prior, Edinson Vólquez