Fig. 1From: The value of ROX index in predicting the outcome of high flow nasal cannula: a systematic review and meta-analysisPRISMA flow diagram of the study selection process. From: Moher D, Liberati A, Tetzlaff J, Altman DG, The PRISMA Group (2009). Preferred reporting items for systematic reviews and meta-analyses: the PRISMA statement. PLoS Med 6(7): e1000097. https://doi.org/10.1371/journal.pmed1000097. For more information, visit www.prisma-statement.orgBack to article page