1. Department of Ultrasound; Fourth People's Hospital of Qinghai Province; Xining China
2. Department of Medical Ultrasound, Shanghai Tenth People's Hospital, Ultrasound Research and Education Institute; Tongji University School of Medicine; Shanghai China
3. Department of Hepatology; Fourth People's Hospital of Qinghai Province; Xining China
4. Department of Gastroenterology; Fourth People's Hospital of Qinghai Province; Xining China