Clinical diagnostic value of mean nocturnal baseline impedance and post-reflux swallow-induced peristaltic wave index for distinguishing functional heartburn from non-erosive reflux disease - Chen, Lei; Luo, Shaohua; Chen, Jiaxi; Li, Zhenxing; Dai, Xiaorong (Gastroenterology Review/Przegląd Gastroenterologiczny, 2025)