1 Department of Vascular Surgery, the Second Xiangya Hospital, Central South University, Changsha, China.
2 Department of Vascular Surgery, the Second Xiangya Hospital, Central South University, Changsha, China; Center of Vascular Surgery, Fuwai Hospital, Chinese Academy of Medical Sciences and Peking Union Medical College, Beijing, China. Electronic address: shuchang@csu.edu.cn.