Table 1.

Search syntax for each database

Name of database	Search string used
CDSR	tinnitus:ti (among Cochrane Reviews)
CINAHL (Cumulated Index to Nursing and Allied Health Literature)	MH tinnitus AND “risk factor**” OR epidemiol* OR cohort OR “case control” OR “cross sectional” OR survey* OR longitudinal OR “pooled analysis" OR “meta analysis” OR representative*
Embase	Tinnitus:ti,ab,kw AND (prevalence:kw OR incidence:kw OR “risk factors” OR case–control:ti,ab OR cohort,ti:ab,kw OR cross-sectional:ti,ab,kw OR meta-analysis:ti,ab OR pooled-analysis:ti,ab OR survey:ti,ab OR representative:ti,ab OR longitudinal:ti,ab) AND [embase]/lim NOT [MEDLINE]/lim AND (“article”/it OR “article in press”/it OR “review”/it)
MEDLINE (Pubmed)	(“tinnitus” [MeSH Terms] OR “tinnitus”[All Fields]) AND (“prevalence"[MeSH Terms] OR “incidence” [MeSH Terms] OR prevalence[OT] OR incidence[OT] OR “risk factors” [MeSH Terms] OR “risk factors” [All fields] OR “case–control” [Tiab] OR “cohort” [Tiab] OR “cohort” [OT] OR “cross-sectional” [Tiab] OR “cross-sectional” [OT] OR meta-analysis[tiab] OR pooled-analysis[tiab] OR survey[tiab] OR representative[tiab] OR longitudinal[tiab])

CDSR Cochrane Database of Systematic Reviews