Fig. 4From: Protective role of nitric oxide donors on endothelium in ischemia-reperfusion injury: a meta-analysis of randomized controlled trialsForest plots for subgroup analysis according to duration of NO donor use (a) and timing of NO donor use (b). Short-term: short-term use (< 24 h) of NO donor; long-term: long-term (> 24 h) use of NO donor. Pre-I/R: pre-ischemic use of NO donor; post-I/R: post-ischemic use of NO donorBack to article page