Systematic review flow diagram.
Additional sources comprised:
1. Trials registries (Cochrane Central Register of Controlled trials, ClinicalTrials.gov, EU Clinical Trials Register, Alltrials.net, WHO International Clinical Trials Registry, NIHR UK Clinical Trials Gateway);
2. Grey literature databases (E-Theses Online Service, OpenThesis, ProQuest, OpenGrey, OpenDOAR;
3. Key journals (Journal of Hand Surgery [European], Journal of Hand Surgery [American], Occupational Medicine, Journal of Occupational Rehabilitation).