[Nonradiographic axial spondyloarthritis: early ankylosing spondylitis].
Li-dan
LD
Zhao
Email: zhaoyan_pumch 2002@yahoo.com.cn.
Yan
Y
Zhao
Xuan
X
Zhang
Feng-chun
FC
Zhang
D006801:Humans; D011859:Radiography; D025241:Spondylarthritis / Q000000981:diagnostic imaging*; D013167:Spondylitis, Ankylosing / Q000175:diagnosis*