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No. Name of Lifestyle Third Class Second Class First Class Type No. of Studies
1High β-carotene+Serum SeleniumSelenium(Se)+β-caroteneSelenium(Se)+Vitamin AJoint effectNo statistical significance factor1
2Low β-carotene+Serum SeleniumSelenium(Se)+β-caroteneSelenium(Se)+Vitamin AJoint effectNo statistical significance factor1