1. Department of Medicine, Shandong University School of Medicine, Jinan, Shandong 250012, P.R. China
2. Shandong Provincial Key Laboratory of Cardiac Disease Diagnosis and Treatment, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272029, P.R. China
3. Division of Cardiology, Affiliated Hospital of Jining Medical University, Jining Medical University, Jining, Shandong 272029, P.R. China
4. Department of Anatomy and Regenerative Biology, The George Washington University, Washington, DC 20037, USA