1. Department of Neurology and Epileptology, The Children's Memorial Health Institute, Al. Dzieci Polskich 20, 04–730 Warsaw, Poland; Department of Physiology, Silesian Medical University, ul. Medyków 18, 40–752 Katowice, Poland
2. Department of Physiology, Silesian Medical University, ul. Medyków 18, 40–752 Katowice, Poland
3. Department of Pathology, The Children's Memorial Health Institute, Al. Dzieci Polskich 20, 04–730 Warsaw, Poland
4. Department of Histology and Embryology, Center for Biostructure Research, Medical University of Warsaw, ul. Chałubińskiego 5, 02–004 Warsaw, Poland
5. Department of Neurology, Children's Hospital and Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115, USA
6. Department of Neurology and Epileptology, The Children's Memorial Health Institute, Al. Dzieci Polskich 20, 04–730 Warsaw, Poland