Fig. 1From: The effect of polyethylene cover intervention on ocular surface disorder of intensive care unit patients: a systematic review and meta-analysisPRISMA 2020 flow diagram. From: Page MJ, McKenzie JE, Bossuyt PM, Boutron I, Hoffmann TC, Mulrow CD, et al. The PRISMA 2020 statement: an updated guideline for reporting systematic reviews. BMJ 2021;372: n71. Doi: https://doi.org/10.1136/bmj.n71Back to article page