Ultrasound-guided thoracic paravertebral injection of dexamethasone palmitate combined with ropivacaine for the treatment of thoracic herpes zoster-related pain: protocol for a prospective, randomized controlled, single-center study - Wang, Liu; Xu, Shengrong; Jiang, Zongbin; He, Ruilin (Frontiers in Pharmacology, 2025)