Abnormal Gastroesophageal Flap Valve is Highly Associated with Endoscopic Reflux Esophagitis after Helicobacter pylori Eradication. - Takeuchi, Rie; Kato, Kimitoshi; Mizuno, Shigeaki; Kawamura, Yo; Kawamura, Fumio; Iwasaki, Ariyoshi; Arakawa, Yasuyuki (Helicobacter, 2004)