Department of Gastroenterology,Toranomon Hospital Kajigaya,1-3-1 Kajigaya,Takatsu-ku,Kawasaki,Kanagawa 213-8587,Japan;
Division of Gastroenterology,Institute for Adult Diseases,Asahi Life Foundation,1-6-1 Marunouchi,Chiyoda-ku,Tokyo 100-0005,Japan;
Department of Gastroenterology,Tokyo Metropolitan Police Hospital;
Department of Gastroenterology,Yokohama City University;
Helicobacter; pylori; Eradication; First-line; treatment; Non-bismuth; quadruple; therapy; Prospective; study;