1 Department of Cardiology, Shanghai Changzheng Hospital, Second Military Medical University, No. 415, Fengyang Road, Huangpu District, Shanghai, People's Republic of China.
2 Department of Cardiology, Shanghai Changzheng Hospital, Second Military Medical University, No. 415, Fengyang Road, Huangpu District, Shanghai, People's Republic of China. chunliang@smmu.edu.cn.