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. 2023 Jun 3;23:1059. doi: 10.1186/s12889-023-15958-4

Table 1.

Sources of literature

Database sources Grey Literature Search Engines

ScienceDirect

Sage Journals Online

Campbell Collaboration

Cochrane collaboration

Embase

Medline

CINAHL

Web of Science

Scopus

OpenGrey

NICE Evidence Search

The Grey Literature Report

Bielefeld Academic Search Engine (BASE)

Australian Bureau of Statistics (ABS)

Google

Google Scholar