1. Department of Neurosurgery, Medical College of Virginia Campus, Virginia Commonwealth University, Richmond, Virginia.
2. Faculdade de Medicina da Universidade do Porto, Porto, Portugal.
3. Department of Anesthesiology and Intensive Care Medicine, Martin-Luther University, Halle (Saale) Germany.
4. Department of Neurosurgery, Inselspital Bern, University of Bern, Switzerland.
5. Department of Anatomy and Neurobiology, Medical College of Virginia Campus, Virginia Commonwealth University, Richmond, Virginia.