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History Joseph Zawislak created his Dr. Shock persona based on Roland with actor John Zacherle 's permission who previously appeared on Philadelphia television .
 Roland, John Zacherle, Philadelphia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Roland, John Zacherle, Philadelphia