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The role of long chain omega - 3 polyunsaturated fatty acids in reducing lipid peroxidation among elderly patients with mild cognitive impairment : a case - control study .
 Chemical: omega - 3 polyunsaturated fatty acids
Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
 Chemical: omega - 3 polyunsaturated fatty acids