Correction to: A multicenter phase III study comparing Simultaneous Integrated Boost (SIB) radiotherapy concurrent and consolidated with S-1 versus SIB alone in elderly patients with esophageal and esophagogastric cancer – the 3JECROG P-01 study protocol - Li, Chen; Wang, Xiaomin; Wang, Xin; Han, Chun; Wang, Ping; Pang, Qingsong; Chen, Junqiang; Sun, Xinchen; Wang, Lan; Zhang, Wencheng; Lin, Yu; Ge, Xiaolin; et al. (BMC Cancer, 2019)