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Study workflow. Abbreviations: LEV, levetiracetam; VPA, valproic acid; EIAED, enzyme-inducing antiepileptic drug. 1 Incomplete or unavailable medical record. 2 Below the lower limit of quantification. 3 Pediatric/elderly patient samples, intravenous injections, non-steady state samples, follow-up loss, low compliance, dose change, underlying liver and/or kidney diseases in addition to epilepsy.
