1. Department of Radiology, West China Hospital, Sichuan University, Chengdu, Sichuan, China
2. Department of Radiology, The Affiliated Hospital of Southwest Medical University, Luzhou, Sichuan, China
3. Department of Radiology, China-Japan Friendship Hospital, Yinghua Dongjie, Chaoyang, Beijing, China
4. Department of Radiology, West China Second University Hospital, Sichuan University, China