Table 1.

Search strategy of the literature study.

A. Search strategy to locate “tension-type headache”	#1. tension-type headache [MeSH]
	#2. TTH [tw]
	#3. primary headache [MeSH]
	#4. or/#1-#3
B. Search strategy to locate acupuncture interventions	#5. acupuncture [MeSH]
	#6. acupuncture therapy [MeSH]
	#7. acupuncture points [MeSH]
	#8. body acupuncture [tw]
	#9. electroacupuncture [MeSH]
	#10. electro-acupuncture [tw]
	#11. electrical acupuncture [tw]
	#12. scalp acupuncture
	#13. dry needling
	#14. triggers point [tw]
	#15. moxibustion [MeSH]
	#16. acupoint [tw]
	#17. or/#5-#16
C. Search strategy to locate literature studies for this study	#4 and #17