Figure 2 Structure of network formed by interventions. The lines between treatment nodes indicate the direct comparisons made with evidences, the size of nodes indicate the number of participants involved in each treatment. Numbers (n/n) with a blue frame near the line indicate ‘number of trials/number of participants’ of the related treatment group, numbers (n/n) with a red frame near the line indicate ‘number of trials/number of participants’ of the related comparisons. (A) Main network meta-analysis. (B) Subgroup analysis. (Made with Stata/MP, version 14.0, manufacturer Stata Corp.).