1 Department of Emergency Medicine, University of Colorado School of Medicine, Aurora, CO, United States of America.
2 Department of Neurology, University of Colorado School of Medicine, Aurora, CO, United States of America.
3 Department of Neurological Surgery, The Ohio State University, College of Medicine, Columbus, OH, United States of America.
4 Department of Emergency Medicine, University of Colorado School of Medicine, Aurora, CO, United States of America. Electronic address: [email protected].