Efficacy and safety of Jianpi Qinghua granules for non-erosive reflux disease with spleen deficiency and damp-heat syndrome: a multicenter, randomized, double-blind, placebo-controlled clinical trial - Zhang, Tai; Bai, Guang; Wang, Wei; Liu, Lin; Zhou, Zhenghua; Ji, Haijie; Zhang, Beihua; Tang, Xudong (Frontiers in Nutrition, 2025)