1. Department of Ultrasound Qilu Hospital of Shandong University Jinan Shandong 250012 China
2. Department of Colorectal Surgery National Cancer Center/National Clinical Research Center for Cancer/Cancer Hospital Chinese Academy of Medical Sciences and Peking Union Medical College Beijing 100021 China
3. Department of General Surgery Qilu Hospital of Shandong University Jinan Shandong 250012 China
4. Department of Clinical Laboratory Qilu Hospital of Shandong University Jinan Shandong 250012 China
5. Department of Pathology Qilu Hospital of Shandong University Jinan Shandong 250012 China