1 Department of Radiology, The Sixth People's Hospital of Chengdu, Chengdu, Sichuan, China.
2 Department of Radiology, The Affiliated Hospital of Southwest Medical University, NO.25, Taiping Road, Jiangyang District, Luzhou, 646000, Sichuan, China.
3 Department of Radiology, The Affiliated Hospital of Southwest Medical University, NO.25, Taiping Road, Jiangyang District, Luzhou, 646000, Sichuan, China. shujiannc@163.com.