Table 1.

The specific keyword combinations used for searching relevant scientific articles.

Keywords	PubMed	Scopus	Web of Science	Total
“Hydrogen sulfide” [Title] AND “vasodilation” [Title]	10	2	7	19
“H2S” [Title] AND “vasodilation” [Title]	4	0	4	8
“Hydrogen sulfide” [Title] AND “vascular regulation” [Title]	2	6	7	15
“H2S” [Title] AND “vascular regulation” [Title]	0	0	7	7