Proton pump inhibitor after endoscopic resection for esophageal squamous cell cancer: multicenter prospective randomized controlled trial

N. Kakushima, K. Hori, H. Ono, T. Horimatsu, N. Uedo, K. Ohata, H. Doyama, K. Kaneko, I. Oda, T. Hikichi, Y. Kawahara, K. Niimi, Y. Takaki, M. Mizuno, S. Yazumi, A. Hosokawa, A. Imagawa, M. Niimi, K. Yoshimura, M. Muto