1. Department of General Surgery, The Second Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong, PR China
2. Department of Surgical Oncology, Shantou Central Hospital, Shantou, Guangdong, PR China
3. Department of Public Health, Shantou University Medical College, Shantou, Guangdong, PR China
4. Department of Medical Imaging, The Second Affiliated Hospital of Shantou University Medical College, Shantou, Guangdong, PR China