1. Department of General Thoracic Surgery, First Affiliated Hospital, Sun Yat‑sen University, Guangzhou, Guangdong 510089, P.R. China
2. Department of Gastrointestinal Surgery, First Affiliated Hospital, Sun Yat‑sen University, Guangzhou, Guangdong 510089, P.R. China
3. Department of Cardio‑Thoracic Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510089, P.R. China