1. Department of Cardiovascular Medicine, Shandong Provincial Third Hospital, Jinan, Shandong 250000, P.R. China
2. Department of Cardiovascular Medicine, The First People's Hospital of Jinan, Jinan, Shandong 250000, P.R. China
3. Digestive Disease Department of Internal Medicine, The First People's Hospital of Jinan, Jinan, Shandong 250000, P.R. China
4. Jinan First Aid Center, Jinan, Shandong 250000, P.R. China