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Improvement of levodopa - induced dyskinesia by propranolol in Parkinson ' s disease .
 levodopa, dyskinesia, propranolol, Parkinson ' s disease
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 levodopa, dyskinesia, propranolol, Parkinson ' s disease