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Individuals with a history of pulmonary, neurologic, hepatic, rheumatic, hematologic, or renal chronic disease, who were treated with immunosuppressive therapy in the 6 months prior to screening, or who used medication or supplements that may have confounded the study results were also excluded

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This study was conducted according to the Preferred Reporting Items for Systematic reviews and Meta-Analyses (PRISMA) checklist (Supplementary Table 1)

doi: 10.1016/S0196-9781(01)00407-7