VEGFA and edema: Abbreviations: BRVO = branch retinal vein occlusion, CI = confidence interval, CNKI = China National Knowledge Infrastructure, GRADE = the grading of recommendations assessment, development, and evaluation, ME = Macular edema, OSF = open science framework, PRISMA-P = the preferred reporting items for systematic reviews and meta-analyses protocols, RCTs = randomized controlled trails, RR = relative risk, SMD = standardized mean difference, VEGF = vascular endothelial growth factor, VIP = China Science and Technology Journal Database, WMD = weighted mean difference.