Table 8.

Search strategy in the CBM database.

Item	Index terms
#1	(“Acupuncture”[Common fields: Intelligent retrieval] OR “scalp acupuncture”[Common fields: Intelligent retrieval] OR “Electroacupuncture”[Common fields: Intelligent retrieval])
#2	(“Mild cognitive impairment”[Common fields: Intelligent retrieval] OR “Mild cognitive decline”[Common fields: Intelligent retrieval] OR “Dementia”[Common fields: Intelligent retrieval] OR “Forgetfulness”[Common fields: Intelligent retrieval] OR “Amnesia”[Common fields: Intelligent retrieval] OR “Memory in decline”[Common fields: Intelligent retrieval] OR “Memory loss”[Common fields: Intelligent retrieval])
#3	(“System evaluation”[Common fields: Intelligent retrieval] OR “Meta analysis”[Common fields: Intelligent retrieval] OR “System review”[Common fields: Intelligent retrieval])
#4	#1 AND #2 AND #3

Adopt intelligent search: realizes the extended search of search words and their synonyms (including subject words).