2170
A prospective , randomized , double - blind pilot study to compare the results of stereotactic unilateral pallidotomy and subthalamotomy in advanced idiopathic Parkinson ' s disease ( PD ) refractory to medical treatment was designed .
 Disease: idiopathic Parkinson ' s disease; Disease: PD
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: idiopathic Parkinson ' s disease; Disease: PD