Figure 1.

PRISMA flow diagram. NMA, network meta-analysis; PRISMA, Preferred Reporting Items for Systematic Reviews and Meta-Analyses; RCTs, randomised controlled trial; SLR, systematic literature review.* Bibliographies of eligible SLR/ NMAs were reviewed to identify any RCTs that met the inclusion criteria and then excluded. # Bibliographies of eligible pooled analyses were reviewed to identify relevent RCTs that met the inclusion criteria.and included only if data were not reported in the individual RCTs.