1. Department of Cardiology, Shaanxi Provincial People’s Hospital, Xi’an, Shaanxi, China (mainland)
2. ECG Exam Room, Function Testing Lab, Shaanxi Provincial People’s Hospital, Xi’an, Shaanxi, China (mainland)
3. Department of Cardiology, Shaanxi Provincial People's Hospital, Xi’an, Shaanxi, China (mainland)
4. Health Examination Center, Shaanxi Provincial People's Hospital, Xi’an, Shaanxi, China (mainland)