Y Yuan1, H J Lu2. 1. Department of Vascular Surgery, Wuxi People's Hospital, Affiliated Hospital of Nanjing Medical University, Wuxi, Jiangsu, China. 2. Department of Vascular Surgery, Wuxi People's Hospital, Affiliated Hospital of Nanjing Medical University, Wuxi, Jiangsu, China. Electronic address: luhuijun_vascular@163.com.