Previous, current, and future stereotactic EEG techniques for localising epileptic foci.

Introduction It is estimated that of the approximately 50–60 million people worldwide with epilepsy [ 1 ], 25–40% have drug-resistant epilepsy (DRE) and this accounts for approximately 80% of all epilepsy care costs, for example in the USA [ 2 ], making the morbidity burden of DRE hugely significant on a global scale.

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