1. Department of Radiology, E-Da Hospital and I-Shou University, Kaohsiung, Taiwan, Province of China

2. Department of Orthopedics, Pontificia Universidad Catolica de Chile, Santiago, Chile

3. Departments of Radiology, University of California, San Diego, CA, USA

4. Departments o Orthopedics, University of California, San Diego, CA, USA

5. Departments of Radiology, University of California, San Diego, CA, USA