1. Department of Hepatobiliary Surgery Nanjing Drum Tower Hospital Clinical College of Nanjing Medical University Nanjing Jiangsu Province 210008 P. R. China
2. Department of Hepatobiliary Surgery Nanjing Drum Tower Hospital The Affiliated Hospital of Nanjing University Medical School Nanjing Jiangsu Province 210008 P. R. China
3. MOE Key Laboratory of Model Animal for Disease Study Department of Endocrinology Nanjing Drum Tower Hospital and Model Animal Research Center School of Medicine Nanjing University Nanjing 210008 P. R. China
4. Department of Gastroenterology The First Affiliated Hospital of Nanjing Medical University Nanjing Jiangsu Province 210029 P. R. China