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A. After a median follow-up of 362 days, we identified recurrent PSS in 31 patients (29.8%). Dotted lines indicate the confidence interval. B. For patients who received (solid line) or did not receive (dotted line) valproic acid (VPA) monotherapy at the time of recurrence or end of follow-up. VPA monotherapy may be insufficient to prevent recurrent PSS (log-rank test, p = 0.013).
