Table 5. Scale for the Assessment of Narrative Review (maximum two stars each) was used to assess the eligibility of narrative reviews.

RCTs: Randomized controlled trials

Author and year of publication	Type of the study	Justification of the article’s importance for the readership	Statement of concrete aims or formulation of questions	Description of the literature search	Referencing	Scientific reasoning (e.g., incorporation of appropriate evidence, such as RCTs in clinical medicine)	Appropriate presentation of data (e.g., absolute vs relative risk; effect sizes without confidence intervals)
Wang et al. 2019 [8]	Narrative review	**	**	-	**	**	**