1 School of Medicine, Dentistry and Biomedical Sciences, Queen's University Belfast, Belfast, United Kingdom.
2 Department of Neurosurgery, Neuro International Collaboration, London, United Kingdom.
3 Division of Neurosurgery, Department of Clinical Neurological Sciences, Schulich School of Medicine and Dentistry, University of Western Ontario, London, ON, Canada.
4 Department of Neurosurgery and Neurology, McGill University Faculty of Medicine, Montreal, QC, Canada.
5 Department of Neurosurgery, Neuro International Collaboration, London, ON, Canada.
6 Division of Neurosurgery, Faculty of Medicine, University of Ottawa, Ottawa, ON, Canada.
7 Department of Neurosurgery, Neuro International Collaboration, Ottawa, ON, Canada.
8 Department of Neurology, Boston Children's Hospital and Harvard Medical School, Boston, MA, United States.
9 Division of Neurosurgery, Department of Surgery, St. Michael's Hospital, University of Toronto, Toronto, ON, Canada.
10 Department of Neurosurgery, The Neurosurgical Atlas and Atlas Meditech, Carmel, IN, United States.
11 Department of Neurological Surgery, Keck School of Medicine of the University of Southern California, Los Angeles, CA, United States.
12 Department of Neurosurgery, Neuro International Collaboration, Los Angeles, CA, United States.