1. Department of Thoracic Surgery, Gaozhou People’s Hospital , Maoming, China
2. Department of Thoracic Surgery, Sun Yat-san University Cancer Center , Guangzhou, China
3. State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine , Guangzhou, China
4. Guangdong Esophageal Cancer Institute , Guangzhou, China
5. Department of Radiation Oncology, Sun Yat-Sen Memorial Hospital of Sun Yat-Sen University , Guangzhou, China
6. Department of Radiation Oncology, Sun Yat-san University Cancer Center , Guangzhou, China