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Using a positron emission tomography ( PET ) study it was shown recently that in migraine without aura certain areas in the brain stem were activated during the headache state , but not in the headache free interval .
 Disease: migraine; Disease: headache; Disease: headache
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 Disease: migraine; Disease: headache; Disease: headache