Fig. 1.

PRISMA flow diagram. Figure modified from Aponte Ribero et al. 2023 [27]. *A PRISMA flow diagram of the original search is provided in Supplementary Figure 1. ^†Studies that only reported on motor function, scoliosis, and/or contracture outcomes were not considered further in this manuscript; data from these studies were described separately in Aponte Ribero et al. 2023. ^‡Some of the 43 studies reported on both respiratory and bulbar function outcomes. Abbreviations: HTA = health technology assessment; PRISMA = Preferred Reporting Items for Systematic reviews and Meta-Analyses.