Fig. 1From: Vitamin C may reduce the duration of mechanical ventilation in critically ill patients: a meta-regression analysisFlow diagram showing the search terms. The searches were carried out on 13 Nov 2019. The searches identified nine trials that we included in our systematic review analysis [11,12,13,14,15,16,17,18,19] and eight of them were included in our meta-analysis [11,12,13,14,15,16,17,18]Back to article page