1. Baylor Research Institute, Dallas, TX, USA
2. the University of Texas Southwestern Medical Center at Dallas, Medical School, Dallas, TX, , USA
3. Department of Ultrasonography, The 2nd Affiliated Hospital of Zhejiang University College of Medicine, Hangzhou, Zhejiang Province, China
4. Department of Internal Medicine, Division of Cardiology, Baylor Heart and Vascular Institute, Baylor University Medical Center, Dallas, Texas, USA