1. Digestive System Department, Shaanxi Provincial Crops Hospital of Chinese People's Armed Police Force, Xi'an, People’s Republic of China
2. The Second Clinical School of Medicine, Shaanxi University of Chinese Medicine, Xianyang, People’s Republic of China
3. Department of Hematology, Xi'an Daxing Hospital, Xi'an, People’s Republic of China
4. Department of Cardiology, Xi’an International Medical Center Hospital, Northwest University, Xi'an, People’s Republic of China
5. Department of Geriatrics Cardiology, The Second Affiliated Hospital of Xi'an Jiaotong University, Xi'an, People’s Republic of China