Skip the marketing, paper at: https://www.nejm.org/doi/abs/10.1056/NEJMc2606815 (although i can't access it right now, and it isn't available on pirate sites)

Interesting to see development in this field. I went to Uni with a young woman that had her hemisphere (partially) split here epilepsy was so bad. It was life changing, both in the reduction of epilepsy and the left/right brain split.