2442
METHODS : This is a cross - sectional study involving 95 patients with PD on uninterrupted levodopa therapy for at least 6 months .
 Disease: PD; Chemical: levodopa
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: PD; Chemical: levodopa