Table 2.

Search strategy for MEDLINE, July 2019

Number	Search items	Hits
1	exp Papillomavirus Vaccines	7128
2	((papilloma$ or hpv) adj2 (vaccin$ or immuniz$)).mp.	10 458
3	(gardasil$ or ceravix$ or cervarix$ or silgard$).mp.	571
4	or/1 to 3	10 492
5	exp American Native Continental Ancestry Group	20 720
6	(native american$ or american indian$ or amerind$).mp.	12 397
7	(indigenous$ or tribe or tribes or tribal$).mp.	41 854
8	(aian or ai an).mp.	806
9	or/5 to 8	63 672
10	4 and 9	60
11	l/ 10 yr=2006-current	60
12	remove duplicates from 11	60
13	exp united states	1 300 858
14	(us or usa or united states).mp.	9 358 201
15	(Alabama$ or Alaska$ or Arizona$ or Arkansa$ or California$ or Colorado$ or Connecticut$ or Delaware$ or Florid$ or Georgia$ or Hawaii$ or Idaho$ or Illinois$ or Indiana$ or Iowa$ or Kansa$ or Kentuck$ or Louisiana$ or Maine$ or Maryland$ or Massachusetts$ or Michigan$ or Minnesota$ or Mississippi$ or Missouri$ or Montana$ or Nebraska$ or Nevada$ or New Hampshire$ or New Jers$ or New Mexic$ or New York$ or North Carolin$ or North Dakota$ or Ohio$ or Oklahoma$ or Oregon$ or Pennsylvania$ or Rhode Island$ or South Carolin$ or South Dakota$ or Tenness$ or Texa$ or Utah$ or Vermont$ or Virginia$ or Washington$ or West Virginia$ or Wisconsin$ or Wyoming$).mp.	674 164
16	or/13 to 15	9 780 569
17	12 and 16	46
18	12 not 17	14
19	from 18 keep 3	1
20	17 or 19	47
21	exp continental population groups/	208 897
22	(race or races or racial$).mp.	131 570
23	21 or 22	302 873
24	4 and 23	502
25	l/ 24 yr=2006-current	500
26	remove duplicates from 25	499
27	26 not 20	466
28	16 and 27	364