1. Department of General Surgery, Qilu Hospital of Shandong University, Jinan, Shandong, China (mainland)
2. Department of General Surgery, People’s Hospital, Zhangqiu District, Jinan, Shandong, China (mainland)
3. Department of Cardiology, The Second Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, China (mainland)