Table 1 Final search string entered to the PubMed database^a

1

(((((((((((((((dispatch) OR dispatcher) OR dispatchers) OR dispatched) OR telephone) OR telephone[MeSH Terms]) OR “emergency medical services”) OR emergency medical services[MeSH Terms]) OR “emergency medical service”) OR emergency medical dispatch[MeSH Terms])) AND ((((((((((“assistance”) OR “assisted”) OR “assist”) OR “instruction”) OR “instructions”) OR “instructed”) OR “instruct”) OR “guidance”) OR “guided”) OR “guide”)))

OR

(((((((((((((((((dispatch-assistance) OR dispatcher-assistance) OR dispatch-assisted) OR dispatcher-assisted) OR dispatch-instruction) OR dispatcher-instruction) OR dispatch-instructions) OR dispatcher-instructions) OR dispatch-instructed) OR dispatcher-instructed) OR dispatcher-guidance) OR dispatch-guided) OR dispatcher-guided) OR DA-CPR) OR T-CPR) OR telemedicine[MeSH Terms]) OR remote consultation[MeSH Terms])))

2

((((((((((((((((((((resuscitation[MeSH Terms]) OR cardiopulmonary resuscitation[MeSH Terms]) OR ((cardiopulmonary) AND resuscitation)) OR cardiopulmonary resuscitation) OR (((cardio) AND pulmonary) AND resuscitation)) OR cardio pulmonary resuscitation) OR CPR) OR basic life support) OR (((basic) AND life) AND support)) OR basic cardiac life support) OR ((((basic) AND cardiac) AND life) AND support)) OR BLS) OR mouth-to-mouth resuscitation) OR compression) OR compressions) OR cardiac massage) OR cardiac massages) OR heart massage) OR heart massage[MeSH Terms]) OR heart massages)