All patients had long-term continuous video EEG monitoring, which lasted 3–10 days depending on the number of seizures captured. The electrodes were placed according to the 10-20 International Electrode System, and bilateral sphenoidal electrodes were added. Referential and bipolar montages were used to investigate the interictal epileptiform discharges and slow waves. All of the scalp video EEG data were read by an experienced EEG technician (NH) during presurgical evaluation and were signed by a clinical epileptologist (LL). Both the technician and clinical epileptologist were blinded to the MEG results.
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