Table 1.

Review approach, conceptual, and historical analysis summary.

Searching keywords	Conceptual analysis	Historical review
Universal health coverage, health, healthcare access, equity, philosophy, historical development, conceptual analysis, social health protection, public health emergency etc.	Terminological analysis, Philosophical and Theoretical analysis, Political analysis, Linkage with health financing, Linkage with Social health protection (SHP)	• Before primary health care (PHC) stage • PHC phase • Millennium Development Goal phase • Sustainable development goal phase