Exploring the mechanisms of acupuncture in improving cognitive function in post-COVID-19 myalgic encephalomyelitis/chronic fatigue syndrome: study protocol for a randomized controlled trial using multimodal MRI. - Luo T; Luo Y; Huang L; Jin H; An Y; Huang J; Luo K; Guo Y; Wang D; Liu D; Wu X (Frontiers in neurology, 2026)