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In contrast , mood switches were less frequent in patients receiving lithium ( 15 % , 4 / 26 ) than in patients not treated with lithium ( 44 % , 8 / 18 ; p = . 04 ) .
 lithium, lithium
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 lithium, lithium