1. Vascular Neurosurgery Department, Russian Polenov Neurosurgical Institute, Branch of National Medical Research Center “Almazov”, St. Petersburg, Russia
2. Department of Angiography, Shastin Central Hospital, Ulaanbaatar, Mongolia
3. phenox GmbH, Bochum, Germany
4. Neuroradiological Clinic, Klinikum Stuttgart, Stuttgart, Germany
5. University Duisburg-Essen, Medizinische Fakultät, Essen, Germany