1. Department of Geriatrics The Second Affiliated Hospital of Chongqing Medical University Chongqing China
2. Department of Anesthesiology, The Second Clinical College of North Sichuan Medical College Nanchong Central Hospital Nanchong Sichuan China
3. Institute of Anorectal Diseases North Sichuan Medical College Nanchong Sichuan China
4. Medical Examination Center, The Second Clinical College of North Sichuan Medical College Nanchong Central Hospital Nanchong Sichuan China
5. Emergency Department, The Second Clinical College of North Sichuan Medical College Nanchong Central Hospital Nanchong Sichuan China