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Kaplan–Meier plots of disease‐free survival of patients with idiopathic rapid eye movement sleep behavior disorder (iRBD). (A–C) Comparing disease‐free survival in iRBD subjects at earlier versus later recruitment epochs in three different centers. (D) Comparing disease‐free survival of conventional versus self‐referrals. (E) Comparing rates of disease‐free survival between recruitment epochs after removing self‐referrals. Log‐rank test P‐values are shown.
