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Seven patients suffering from Parkinson ' s disease ( PD ) with severely disabling dyskinesia received low - dose propranolol as an adjunct to the currently used medical treatment .
 Parkinson ' s disease, PD, dyskinesia, propranolol
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Parkinson ' s disease, PD, dyskinesia, propranolol