1 The School of Medicine, Xiamen University Malaysia, Selangor, Malaysia.
2 Department of General Surgery, School of Medicine, The First Affiliated Hospital of Xiamen University, Xiamen University, Xiamen, China.
3 Department of Gastroenterology, School of Medicine, The First Affiliated Hospital of Xiamen University, Xiamen University, Xiamen, China. hwf0625@xmu.edu.cn.
4 The School of Clinical Medicine, Fujian Medical University, Fuzhou, China. hwf0625@xmu.edu.cn.