1 Department of Cardiovascular Surgery, The Affiliated Hospital of Southwest Medical University, 8 Kangcheng Road, Jiangyang District, Luzhou, Sichuan Province 646000, China.
2 School of Clinical Medicine, Southwest Medical University, 1 Xianglin Road, Longmatan District, Luzhou, Sichuan Province 646000, China.
3 Department of Ultrasound, The Affiliated Hospital of Southwest Medical University, Luzhou 646000, China.