1. Department of Radiology The First Affiliated Hospital of Xi'an Jiaotong University Xi'an China
2. Department of Radiology The Affiliated Hospital of Shaanxi University of Traditional Chinese Medicine Xianyang China
3. Department of Radiology Xi'an High‐tech Hospital Xi'an China
4. Department of Radiology Gansu Provincial Hospital of Traditional Chinese Medicine Lanzhou China
5. Department of Radiology China‐Japan Friendship Hospital Beijing China