In 2013, Parent survey of cannabidiol-enriched cannabis use in pediatric treatment-resistant epilepsy
BACKGROUND: Thirteen children had Dravet syndrome, four had Doose syndrome, and one each had Lennox-Gastaut syndrome and idiopathic epilepsy. The average number of anti-epileptic drugs (AEDs) tried before using cannabidiol-enriched cannabis was 12.
You can read the full article here => https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4157067/