PubMed	EMBASE (Ovid)	CINAHL (EBSCO)
#1 "Nasal Polyps"[MeSH] #2 "Polyps"[MeSH] #3 polyp* [tiab] #4 #2 OR #3 #5 "Nose"[MeSH] #6 nose* [tiab] OR nasal* [tiab] OR nasi [tiab] OR intranasal* [tiab] OR sinonasal* [tiab] OR paranasal* [tiab] #7 #5 OR #6 #8 #4 AND #7 #9 #1 OR #8	1 Nose Polyp/ 2 exp Polyp/ 3 polyp*.tw. 4 3 or 2 5 exp Nose/ 6 (nose* or nasal* or nasi or intranasal* or sinonasal* or paranasal*).tw 7 6 or 5 8 4 and 7 9 8 or 1	S1 (MH "Nasal Polyps") S2 (MH "Polyps") S3 TX polyp* S4 (MH "Nose+") S5 TX nose* OR nasal* OR nasi OR intranasal* OR sinonasal* OR paranasal* S6 (S2 OR S3) AND (S4 OR S5) S7 S1 OR S6
Web of Science	CAB Abstracts (Ovid)	ISRCTN
#1 TS=polyp* #2 TS=(nose* OR nasal* OR nasi OR intranasal* OR sinonasal* OR paranasal*) #3 #2 AND #1	1 polyp*.tw. 2 exp Nose/ 3 (nose* or nasal* or nasi or intranasal* or sinonasal* or paranasal*).tw. 4 3 or 2 5 4 and 1	(nose OR nasal) AND polyp%