1. Department of Anatomical Sciences, School of Medicine, St. George’s University, Grenada, West Indies
2. Department of Anatomy, Medical School Varmia and Mazuria, Olsztyn, Poland
3. Division of Neurosurgery, University of Alabama, Birmingham, AL. U.S.A.
4. Pediatric Neurosurgery, Children’s Hospital, Birmingham, AL. U.S.A.
5. Department of Anatomical Sciences, School of Medicine, St. George’s University, Grenada, West Indies and Department of Anatomy, Medical School Varmia and Mazuria, Olsztyn, Poland