CRSO	MEDLINE (Ovid)	Embase (Ovid)
#1 MESH DESCRIPTOR Hearing Loss EXPLODE ALL TREES #2 MESH DESCRIPTOR Persons With Hearing Impairments EXPLODE ALL TREES #3 (hearing near (loss or impair*)):TI,AB,KY #4 deaf*:TI,AB,KY #5 #1 OR #2 OR #3 OR #4 #6 MESH DESCRIPTOR Hearing Aids #7 ("hearing aid*" or hearing‐aid* or "hearing device*" or "hearing instrument*" or "hearing system*"):TI,AB,KY #8 (hearing near (loss or impair*) near (amplif* or aided or unaided or aid)):TI,AB,KY #9 #6 OR #7 OR #8 #10 #5 AND #9	1 exp Hearing Loss/ 2 exp Persons With Hearing Impairments/ 3 (hearing adj3 (loss or impair*)).ab,ti. 4 "deaf*".ab,ti. 5 1 or 2 or 3 or 4 6 Hearing Aids/ 7 (hearing adj3 (loss or impair*) adj6 (amplif* or aided or unaided or aid)).ab,ti. 8 ("hearing aid*" or hearing‐aid* or "hearing device*" or "hearing instrument*" or "hearing system*").ab,ti. 9 6 or 7 or 8 10 5 and 9	1 exp hearing impairment/ 2 (hearing adj3 (loss or impair*)).ti,ab. 3 "deaf*".ti,ab. 4 1 or 2 or 3 5 hearing aid/ 6 ("hearing aid*" or hearing‐aid* or "hearing device*" or "hearing instrument*" or "hearing system*").ti,ab. 7 (hearing adj3 (loss or impair*) adj6 (amplif* or aided or unaided or aid)).ti,ab. 8 5 or 6 or 7 9 4 and 8
CINAHL	LILACS	Trial Registries
S9 S4 AND S8 S8 S5 OR S6 OR S7 S7 TX (hearing n3 (loss or impair*) n6 (amplif* or aided or unaided)) S6 TX "hearing aid*" or hearing‐aid* or "hearing device*" or "hearing instrument*" or "hearing system*" S5 (MH "Hearing Aids") S4 S1 OR S2 OR S3 S3 TX deaf* S2 TX hearing n3 (loss or impair*) S1 (MH "Hearing Disorders") OR (MH "Deafness") OR (MH "Hearing Loss, Partial+")	((((TW:hearing OR TW:Auditiva) AND (TW:loss OR TW:impair* OR TW:perd*)) OR TW:deaf*) AND (TW:amplif* or TW:aided or TW:unaided or TW:aid)) OR TW:"hearing aid*" or TW:hearing‐aid* or TW:”hearing device*" or TW:”hearing instrument*" or TW:”hearing system*" OR TW:Audífonos OR TW:”Auxiliares de Audição”	ClinicalTrials.gov "hearing aid" OR "hearing aids" OR (("hearing loss" OR "hearing impairment") AND (amplification OR aided OR aid OR unaided)) OR Intervention: "hearing aid" OR "hearing aids" OR (("hearing loss" OR "hearing impairment") AND (amplification OR aided OR aid OR unaided)) ICTRP hearing aid* or hearing‐aid* or "hearing device*" or "hearing instrument*" or "hearing system*"