1. Department of Digestion, University‑Town Hospital of Chongqing Medical University, Chongqing 401331, P.R. China
2. Department of Infection, Rongchang District People's Hospital of Chongqing, Chongqing 402460, P.R. China
3. Department of Anesthesia, Rongchang District People's Hospital of Chongqing, Chongqing 402460, P.R. China
4. Department of Digestion, Rongchang District People's Hospital of Chongqing, Chongqing 402460, P.R. China
5. Department of Neurosurgery, The First Hospital Affiliated to Army Military Medical University (Southwest Hospital), Chongqing 400038, P.R. China