Affiliation: | aDivision of Neurosurgery, David Geffen School of Medicine, University of California, Los Angeles 90095, USA bDepartment of Neurology, David Geffen School of Medicine, University of California, Los Angeles 90095, USA cDepartment of Neurology, Georgetown University, Washington DC 20057, USA dWashington Hospital Center, Washington DC 20010, USA eDepartment of Emergency Medicine, David Geffen School of Medicine, University of California, Los Angeles, USA fDepartment of Biomathematics, David Geffen School of Medicine, University of California, Los Angeles, USA |