1. Cheeloo College of Medicine, Shandong University, Jinan, Shandong, 250100, China
2. Shandong Qianfoshan Hospital, Cheeloo College of Medicine, Shandong University, Jinan, Shandong, 250100, China
3. Department of Gastroenterology, Taian City Central Hospital, Taian, Shandong, 271000, China
4. Department of Vasculocardiology, Taian City Central Hospital, Taian, Shandong, 271000, China