Table 2. Databases searched and the order of searching.

1. Databases of systematic reviews, databases with separate indexing of systematic reviews, guideline registries: Cochrane Database of Systematic Reviews (CDSR); the Centre for Reviews and Dissemination databases (DARE, HTA, NHSEED); Joanna Briggs Institute: Database of Systematic Reviews and Implementation Reports, COnNECT+; Physiotherapy Evidence Database (PEDro); National Guideline Clearinghouse; Turning Research Into Practice (TRIP); Campbell Library

2. Websites of institutions: Scoliosis Research Society (SRS), Society for Spinal Orthopaedic and Rehabilitation Treatment (SOSORT), International Research Society for Spinal Deformities (IRSSD), Guidelines International Network (G-I-N), Scottish Intercollegiate Guideline Network (SIGN), National Institute for Clinical Excellence, UK (NICE), Agency for Healthcare Research and Quality (AHRQ), USA/Evidence-based Practice Centers: Evidence-based Reports, National Health and Medical Research Council, Australia (NHMRC)

3. General bibliographic databases: MEDLINE through PubMed, Web of Science: Science Citation Index – EXPANDED (SCI – EXPANDED), SportsDiscus through EBSCO