1. Department of Neurology, Division of Behavioral Neurology, University of Iowa College of Medicine, Iowa City, Iowa
2. Division of Cerebrovascular Disease, University of Iowa College of Medicine, Iowa City, Iowa
3. Department of Radiology, Division of Neuroradiology, University of Iowa College of Medicine, Iowa City, Iowa
4. Department of Surgery, Division of Neurosurgery, University of Iowa College of Medicine, Iowa City, Iowa