1. NHC Key Laboratory of Drug Addiction Medicine (Kunming Medical University), The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan�650032, P.R. China
2. NHC Key Laboratory of Drug Addiction Medicine (Kunming Medical University), The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan 650032, P.R. China
3. Yunnan Institute of Digestive Disease, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan�650032, P.R. China
4. Shanghai International Travel Healthcare Center, Shanghai 200000, P.R. China
5. Yunnan Institute of Digestive Disease, The First Affiliated Hospital of Kunming Medical University, Kunming, Yunnan 650032, P.R. China