MAPT and Behcet disease: In cohort-3, the strong associations of CSF BD-tau and t-tau in cohorts 1 and 2 were replicated (r = 0.92, p < 0.001; Supplementary Fig. 2C), so was the correlation of serum BD-tau with CSF t-tau (r = 0.38, p < 0.001; Supplementary Fig. 3F).