1. Department of Cardiology, The Affiliated Hospital of Guizhou Medical University, Guiyang, Guizhou 550004, P.R. China
2. Department of Orthopedic Surgery, The Affiliated Hospital of Guizhou Medical University, Guiyang, Guizhou 550004, P.R. China
3. Department of Cardiology, Qian Xi Nan People's Hospital, Bijie, Guizhou 562400, P.R. China