Fig. 1.

The process of study selection according to Preferred Reporting Items for Systematic Reviews and Meta- Analyses (PRISMA) guidelines. Our search strategy found 528 articles, 176 of which were deleted as duplicate documents retrieved from two or more databases. After carefully examining their abstracts and titles, we excluded 263 articles. Among the remaining 89 articles, 79 articles were excluded due to lack of valid data. Finally, 10 RCTs articles involving a total of 663 subjects (330 in the n-3 PUFAs group and 333 in the control group) were selected for this meta-analysis.