Effect of acupuncture in patients with postprandial distress syndrome: study protocol for a randomized controlled trial - Yan, Zhaobo; Xu, Xuan; Liu, Mailan; MuRong, Zhimiao; Zhong, Huan; Luo, Rong; He, Haolong; Liu, Weiai; Du, Geshu; Liu, Mi (Frontiers in Medicine, 2025)