1. Department of Ultrasound Diagnostics; Xijing Hospital, the Fourth Military Medical University; Xi'an Shaanxi China
2. Department of Ultrasound Diagnostics; Xi'an Central Hospital, the Third Affiliated Hospital of Jiao Tong University; Xi'an Shaanxi China
3. Department of CT & MRI; Xi'an Central Hospital, the Third Affiliated Hospital of Jiao Tong University; Xi'an Shaanxi China
4. Department of Neurosurgery; Xijing Hospital, the Fourth Military Medical University; Xi'an Shaanxi China