XU Lin, LI Zhi-liang, ZHAO Lian-you, LIU Ying-feng, LI Gong-xin, DING Ming-xue, ZHAO Yi-qiao, FU Qiang, ZHAO Xia Department of Cardiology, Zhujiang Hospital, Southern Medical University, Guangzhou 510282, China; Department of Cardiology, Tangdu Hospital, Fourth Military Medical University, Xi’an 710038, China