A randomized controlled Phase II/III study comparing endoscopic balloon dilation combined with steroid injection versus radial incision and cutting combined with steroid injection for refractory anastomotic stricture after esophagectomy: Japan Clinical Oncology Group Study JCOG1207 - Kataoka, K; Aoyama, I; Mizusawa, J (Jpn J Clin Oncol, 2015)