1. The First Affiliated Hospital, Jinan University, Guangzhou, Guangdong, China (mainland)
2. Department of Cardiovascular Medicine, The First People’s Hospital of Changde, Changde, Hunan, China (mainland)
3. Department of Gastroenterology, The First People’s Hospital of Changde, Changde, Hunan, China (mainland)
4. Department of Ultrasonic, The First People’s Hospital of Changde, Changde, Hunan, China (mainland)