The criteria for all participants were: (a) focal brain lesions on T1-weighted and T2weighted fluid-attenuated inversion-recovery MR images; (b) poor imaging quality or head movement more than 3 mm in translation or 3◦ in rotation; and (c) falling asleep during MRI examination according to a self-report.

The criteria for all participants were: (a) focal brain lesions on T1-weighted and T2weighted fluid-attenuated inversion-recovery MR images; (b) poor imaging quality or head movement more than 3 mm in translation or 3◦ in rotation; and (c) falling asleep during MRI examination according to a self-report.

The criteria for all participants were: (a) focal brain lesions on T1-weighted and T2weighted fluid-attenuated inversion-recovery MR images; (b) poor imaging quality or head movement more than 3 mm in translation or 3◦ in rotation; and (c) falling asleep during MRI examination according to a self-report.

The criteria for all participants were: (a) focal brain lesions on T1-weighted and T2weighted fluid-attenuated inversion-recovery MR images; (b) poor imaging quality or head movement more than 3 mm in translation or 3◦ in rotation; and (c) falling asleep during MRI examination according to a self-report.

The criteria for all participants were: (a) focal brain lesions on T1-weighted and T2weighted fluid-attenuated inversion-recovery MR images; (b) poor imaging quality or head movement more than 3 mm in translation or 3◦ in rotation; and (c) falling asleep during MRI examination according to a self-report.

The criteria for all participants were: (a) focal brain lesions on T1-weighted and T2weighted fluid-attenuated inversion-recovery MR images; (b) poor imaging quality or head movement more than 3 mm in translation or 3◦ in rotation; and (c) falling asleep during MRI examination according to a self-report.

The criteria for all participants were: (a) focal brain lesions on T1-weighted and T2weighted f luid-attenuated inversion-recovery MR images; (b) poor imaging quality or head movement more than 3 mm in translation or 3◦ in rotation; and (c) falling asleep during MRI examination according to a self-report.

The criteria for all participants were: (a) focal brain lesions on T1-weighted and T2weighted f luid-attenuated inversion-recovery MR images; (b) poor imaging quality or head movement more than 3 mm in translation or 3◦ in rotation; and (c) falling asleep during MRI examination according to a self-report.