Fig. 1From: Efficacy and safety profile of doxofylline compared to theophylline in asthma: a meta-analysisPRISMA flow diagram for the identification of studies included in the meta-analysis (a) and diagram displaying the network across the treatments; the links between nodes indicate the direct comparisons between pairs of treatments; the numbers shown along the link lines indicate the number of patients comparing pairs of treatments head-to-head (b)Back to article page