1. Department of Neurosurgery, Seattle Science Foundation, Seattle, WA, USA;
2. Department of Anatomical Sciences, St. George’s University, True Blue, Grenada;
3. Department of Neurosurgery, Swedish Neuroscience Institute, Seattle, WA, USA;
4. Department of Neurosurgery, Loma Linda University, Loma Linda, CA, USA;
5. Saarland University Medical Center, Faculty of Medicine, Saarland University, Homburg, Germany;
6. Department of Neurosurgery, Mayo Clinic, Rochester, MN, USA