Table 1
Search strategy in MEDLINE
Search ID
Search terms and filters
Number of hits
#1
Child terms
Filters: Infant (Birth to 23 months)
Preschool (2–5 years)
1 270 466
#2
Migration terms
Filter: Human
36 639
#3
Immunisation terms
Filter: Human
257 701
#4
#1 AND #2 AND #3
478