Table 1.

List of domains and keywords for the search

No	Domain	Keywords
1	Barriers	“barriers” OR “issues” OR “obstacles” OR “difficulties” OR “problems” OR “challenges” OR “lessons” OR “experiences”
2	Healthcare finance	“health finance” OR “healthcare finance” OR “health expenditure” OR “healthcare expenditure” OR “health insurance system”
3	Universal Health Coverage	“universal health coverage” OR “universal health care” OR “UHC” OR “universal coverage” OR “utility” OR “equity”
4	ASEAN countries	“ASEAN” OR “Southeast Asia” OR “Brunei” OR “Brunei Darussalam” OR “Cambodia” OR “Indonesia” OR “Lao PDR” OR “Lao” OR “Malaysia” OR “Myanmar” OR “Philippines” OR “Singapore” OR “Thailand” OR “Vietnam”