1. Clinical School of the Second People’s Hospital, Tianjin Medical University, Tianjin 300070, China
2. Department of Gastroenterology and Hepatology, Tianjin Second People’s Hospital, Tianjin 300192, China
3. Department of Ultrasonography, Tianjin Second People’s Hospital, Tianjin 300192, China
4. Department of Toxicology and Sanitary Chemistry, School of Public Health, Tianjin Medical University, Tianjin 300070, China