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Although much has been written about the management of the more common adverse effects of lithium , such as polyuria and tremor , more subtle lithium side effects such as cognitive deficits , loss of creativity , and functional impairments remain understudied .
 lithium, polyuria, tremor, lithium, cognitive deficits, loss of creativity, functional impairments
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: Disease, Chemical 
Text: {0} 
Answer:
 lithium, polyuria, tremor, lithium, cognitive deficits, loss of creativity, functional impairments