1. Medical Imaging Center, Luoyang Orthopedic-Traumatological Hospital of Henan Province (Henan Provincial Orthopedic Hospital), Luoyang, Henan Province, China
2. Department of Radiology, The Third Affiliated Hospital of Henan University of Traditional Chinese Medicine, Zhengzhou, Henan Province, China
3. Department of Radiology, China-Japan Union Hospital of Jilin University, Changchun, Jilin Province, China.