1. Medical Decision and Economic Group, Department of Pharmacy, Ren Ji Hospital, South Campus, School of Medicine, Shanghai Jiaotong University, Shanghai, PR China;
2. Department of Gastroenterology, Ren Ji Hospital, School of Medicine, Shanghai Jiaotong University, Shanghai, PR China;
3. Department of Infectious Diseases, Ruijin Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, PR China