1 Department of Vascular Surgery, the Second Xiangya Hospital, Central South University, Changsha, China; Institute of Vascular Diseases, Central South University, Changsha, China.
2 Department of Vascular Surgery, the Second Xiangya Hospital, Central South University, Changsha, China; Institute of Vascular Diseases, Central South University, Changsha, China. Electronic address: shuchang@csu.edu.cn.