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In a placebo - controlled , single - blinded , crossover study , we assessed the effect of " real " repetitive transcranial magnetic stimulation ( rTMS ) versus " sham " rTMS ( placebo ) on peak dose dyskinesias in patients with Parkinson ' s disease ( PD ) .
 dyskinesias, Parkinson ' s disease, PD
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 dyskinesias, Parkinson ' s disease, PD