#	Searches	Results
1	(vaccin* and (uptake or coverage)).ti.	1705
2	(vaccin* adj (uptake or coverage)).ab.	5122
3	or/1‐2	5604
4	vaccination.cw,hw,id.	53,695
5	(immunisation or immunization).cw,hw,id.	59,234
6	or/4‐5	68,004
7	3 or 6	68,533
8	adolescents/	45,303
9	young adults/	9363
10	youth/	9910
11	(adolescent? or youth? or young adult? or teenager? or teen? or juvenile?).ti,ab,cw,hw,id.	81,376
12	or/8‐11	81,376
13	7 and 12	3563
14	(trial or intervention? or effect? or impact? or multicenter or multi center or multicentre or multi centre).ti.	307,550
15	(randomiz* or randomis* or controlled or control group? or (before adj5 after) or (pre adj5 post) or ((pretest or pre test) and (posttest or post test)) or quasiexperiment* or quasi experiment* or evaluat* or time series or time point? or repeated measur*).ti,ab,cw,hw,id.	637,049
16	or/14‐15	819,614
17	13 and 16	1294