1. Center for Сerebral Neurosurgery, Mechnikov Dnipropetrovsk Regional Clinical Hospital, Dnipro, Ukraine;
2. Endovascular Сenter, Mechnikov Dnipropetrovsk Regional Clinical Hospital, Dnipro, Ukraine;
3. Department of Neurosurgery, MedStar Georgetown University Hospital, Washington, DC; and
4. Department of Neurosurgery, University of Michigan, Ann Arbor, Michigan