Table 1.

Population, exposure, outcome (PEO) framework, and medical subject headings (MeSH)^*

Key concepts based on PEO framework	Associated synonyms/MeSH
Population: Midwives	Midwife/midwives/midwifery
	Nurse-midwife
	Birth attendant(s)
	Traditional birth attendant(s)
Exposure: eHealth and mHealth	eHealth
	mHealth
	telehealth
	telemedicine
	mobile health
	electronic health
	telecommunication(s)
	digital health
	information and communication
	technology/technologies
	ICT
	information technology/technologies
	internet
	mobile technology/technologies
	text message(s)/messaging
Outcome: Perspectives (of the population)	Perspective(s)
	View(s)
	Opinion(s)
	Perception(s)/perceive(s)
	Belief(s)/believe Thoughts/think
	Experience(s)
	Attitude(s)

^*The three concepts and their synonyms were combined in Boolean phrases, using ‘AND’ and ‘OR’ where necessary in search strings.