1. Department of Medical Ultrasound Shanghai Tenth People's Hospital Ultrasound Research and Education Institute School of Medicine Tongji University Shanghai Engineering Research Center of Ultrasound Diagnosis and Treatment National Clinical Research Center of Interventional Medicine Shanghai 200072 P. R. China
2. Department of In‐patient Ultrasound The Second Affiliated Hospital Harbin Medical University Harbin 150001 P. R. China
3. Department of Gastroenterology Shanghai Tenth People's Hospital Tongji University School of Medicine Shanghai 200072 P. R. China
4. Materdicine Lab School of Life Sciences Shanghai University Shanghai 200444 P. R. China
5. Department of Ultrasound Zhongshan Hospital Fudan University Shanghai 200032 P. R. China