1 School of Clinical Medicine, Peking Union Medical College, Beijing, China.
2 Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China.
3 Department of Internal Medicine, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China.
4 Department of Radiology, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China.
5 Department of Rheumatology, Fangshan Hospital Beijing University of Chinese Medicine, Beijing, China.