Table 3.

Specific databases' string and results.

Database	Search string	Results (n. Tot. items found)
PubMed	((“veins”[MeSH Terms] OR “veins”[All Fields] OR “venous”[All Fields]) AND (“catheter s”[All Fields] OR “catheters”[MeSH Terms] OR “catheters”[All Fields] OR “catheter”[All Fields])) AND ((guideline[Filter] OR meta-analysis[Filter] OR systematicreview[Filter]) AND (humans[Filter]) AND (english[Filter]) AND (alladult[Filter]) AND (2015:2020[pdat]))	99
Embase	venous AND ('catheter'/exp OR catheter) AND ([cochrane review]/lim OR [systematic review]/lim OR [meta analysis]/lim) AND ([article]/lim OR [review]/lim) AND ([adult]/lim OR [aged]/lim) AND [humans]/lim AND [english]/lim AND [2015-2020]/py	66
Web of science	(TI=(venous AND catheter)) AND LANGUAGE: (English) AND DOCUMENT TYPES: (Review)	107
Scopus	TITLE (venous AND catheter) AND PUBYEAR > 2014 AND PUBYEAR < 2021 AND (LIMIT-TO (DOCTYPE, “review”)) AND (LIMIT-TO (LANGUAGE, “English”))	110
	Tot.	382