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The authors report a mutation in exon 5 of GCH1 in a patient with adult - onset oromandibular dystonia and no obvious family history of dystonia .
 oromandibular dystonia, dystonia
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease 
Text: {0} 
Answer:
 oromandibular dystonia, dystonia