1 Department of Neurological Surgery, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA; Division of Neurosurgery, Department of Surgery, University of Toronto, Toronto, ON, Canada. Electronic address: nathan.shlobin@northwestern.edu.
2 Division of Neurosurgery, Toronto Western Hospital, Toronto, ON, Canada; Temmy Latner Center for Palliative Care, Mount Sinai Hospital, Toronto, ON, Canada.