4748
In 29 patients , the pallidotomies were performed with the Leksell Gamma Knife and in 22 they were performed with the standard radiofrequency ( RF ) method .
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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:
 None