Table 1. Inclusion and exclusion criteria.

Criterion	Inclusion	Exclusion
Time	1978 to October 10, 2021
Language	English	Non-English studies
Type of article	Primary qualitative studies or mixed method articles that included qualitative data collection	Quantitative studies, conference abstracts, commentaries or protocols, scoping, or systematic reviews
Study focus	Articles that discussed factors influencing adoption and implementation of WHO EML/NML policies at a country level (that also mentioned WHO EML)	All other articles related to WHO EML studies that discussed essential medicines, medicine coverage, access to medicines, and essential medicines policy without a focus on WHO EML adaption and implementation
Population	All

WHO EML, World Health Organization Model List of Essential Medicines.