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Lesions of the substantia nigra are therefore associated with erectile dysfunction in rats and may serve as a model to study erectile dysfunction in Parkinson ' s disease .
 Disease: erectile dysfunction; Disease: erectile dysfunction; Disease: Parkinson ' s disease
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: erectile dysfunction; Disease: erectile dysfunction; Disease: Parkinson ' s disease