作者单位:Harvard Med Sch, Ragon Inst, Boston, MA 02115 USA[1]Massachusetts Gen Hosp, Dept Radiol, Boston, MA 02114 USA[2]Massachusetts Gen Hosp, Dept Rheumatol, Boston, MA 02114 USA[3]Massachusetts Gen Hosp, Dept Neurol, Boston, MA 02114 USA[4]Massachusetts Gen Hosp, Dept Pathol, Boston, MA 02114 USA[5]