1. Department of Cardiovascular Medicine, The First Affiliated Hospital of Xi'an Jiaotong University, Xi'an, Shanxi 710061, P.R. China
2. Department of Respiratory Medicine, The Fifth Affiliated Hospital of Zunyi Medical University, Zhuhai, Guangdong 519100, P.R. China
3. Department of Cardiovascular Medicine, The Fifth Affiliated Hospital of Zunyi Medical University, Zhuhai, Guangdong 519100, P.R. China