Xiaoguang Cheng is Director and Professor at the Department of Radiology, Beijing Jishuitan Hospital, Beijing, China. He is also the Immediate Past President of Asia Musculoskeletal Society. Yongbin Su is Chief Physician at the same department with Xiaoguang Cheng. Mingqian Huang is a Professor at the Department of Radiology, Stony Brook University, Stony Brook, NY, USA.