1. Department of Gastrointestinal Surgery, The Affiliated Hospital of Qingdao University, Qingdao, 266000 Shandong, China
2. Department of Wound Stoma Clinic, Laixi People’s Hospital, Qingdao, 266600 Shandong, China
3. Department of Thoracic Surgery, The Affiliated Hospital of Qingdao University, Qingdao, 266000 Shandong, China
4. Department of Gastrointestinal Surgery Ward, Jinan 4th People’s Hospital, Jinan, 250031 Shandong, China