Table 1.

Example of search terms/filters used in PubMed

Concept	[1] Prehospital care	[2] QI
Search terms	Ambulances[mh] OR Emergency Medical Technicians[mh] OR Air Ambulances[mh] OR paramedic*[tiab] OR ems[tiab] OR emt[tiab] OR prehospital[ti[ab] OR pre-hospital[tiab] OR first responder*[tiab] OR emergency medical technician*[tiab] OR emergency services(tiab] OR ambulance*[tiab]	(QI related search terms)
Search filter	[1] AND [2], English only; Systematic Reviews and Meta-Analyses/Meta-Synthesis only (Change to ‘[1] AND [2], English only’ if no or poor-quality Systematic Reviews and Meta-Analyses/Meta-Synthesis are identified)

QI, quality indicator.