1. Department of Cardiovascular Ultrasound, The First Hospital of China Medical University, Shenyang, Liaoning 110001, P.R. China
2. The First Clinical College of China Medical University, The First Hospital of China Medical University, Shenyang, Liaoning 110001, P.R. China
3. Tumor Etiology and Screening Department of Cancer Institute and General Surgery, The First Hospital of China Medical University, Shenyang, Liaoning 110001, P.R. China