1. Department of Radiology, Chongzuo People's Hospital, Chongzuo,
Guangxi 532200, P.R. China
2. Department of Cardiovascular Medicine, Chongzuo People's Hospital, Chongzuo,
Guangxi 532200, P.R. China
3. Department of Radiology, The People's Hospital of Qinzhou, Qinzhou, Guangxi 535000, P.R. China
4. Department of Physiology, Guangxi Medical University, Nanning, Guangxi 530021, P.R. China