Table 1.

Search strategy (PubMed database).

Number	Search items
#1	Mesh: “Hemifacial spasm”
#2	Ti/Ab: “Hemifacial spasm” OR “Primary Hemifacial spasm” OR “Spasm, Hemifacial” OR “Hemifacial Spasms” OR “Spasms, Hemifacial” OR “Facial Spasm, Unilateral” OR “Facial Spasms, Unilateral” OR “Spasm, Unilateral Facial” OR “Spasms, Unilateral Facial” OR “Unilateral Facial Spasm” OR “Unilateral Facial Spasms” OR “Hemifacial Myokymia” OR “Myokymia, Hemifacial”
#3	#1 OR #2
#4	Mesh: “Drugs, Chinese Herbal”
#5	Ti/Ab: “Drugs, Chinese Herbal” OR “Qianzheng powder” OR “Chinese Drugs, Plant” OR “Chinese Herbal Drugs” OR “Herbal Drugs, Chinese” OR “Plant Extracts, Chinese” OR “Chinese Plant Extracts” OR “Extracts, Chinese Plant”
#6	#4 OR #5
#7	Mesh: “randomized controlled trial [Publication Type]” OR “randomized controlled trials as topic” OR “controlled clinical trial [Publication Type]” OR “controlled clinical trials as topic”
#8	Ti/Ab: “randomized”
#9	#7 OR #8
#10	#3 AND #6 AND #9