The Preferred Reporting Items of Systematic Reviews and Meta-Analyses: FFA and sunscreen

The literature search is depicted using a flow diagram adapted from the Preferred Reporting Items for Systematic Reviews and Meta-Analyses文献检索过程通过改编自《系统评价与Meta分析首选报告条目》（Preferred Reporting Items for Systematic Reviews and Meta-Analyses）的流程图予以呈现。