Dose-effect relationship of different acupuncture courses on chronic insomnia disorder: study protocol for a randomized controlled trial
BackgroundChronic insomnia disorder (CID) is increasing in prevalence year by year, is long lasting, and potentially risky.Acupuncture has been widely used in the clinical management of this condition.However, there is still a lack of direct evidence on the dose-effect relationship between different acupuncture courses and clinical efficacy.To iden