1 Department of Radiology, Beijing Anzhen Hospital, Capital Medical University, No. 2, Anzhen Road, Chaoyang District, Beijing, 100029, China.
2 School of Biomedical Engineering, Sun Yat-Sen University, Guangzhou, China.
3 Cardiovascular Research Centre, Royal Brompton Hospital, London, SW3 6NP, UK.
4 National Heart and Lung Institute, Imperial College London, London, SW7 2AZ, UK.
5 Department of Radiology, Beijing Anzhen Hospital, Capital Medical University, No. 2, Anzhen Road, Chaoyang District, Beijing, 100029, China. leixu2001@hotmail.com.