1. Department of Pediatric Neurosurgery, Medical University of Silesia in Katowice, 40-752 Katowice, Poland
2. Department of Neurosurgery, Medical University of Silesia in Katowice, 40-752 Katowice, Poland
3. Department of Human Anatomy, Medical University of Silesia in Katowice, 40-752 Katowice, Poland