1. Department of Neurosurgery, University Hospital Dubrava, Zagreb, Croatia;
2. Albert Einstein College of Medicine, New York, New York, U.S.A.;
3. Department of Neurosurgery, Inselspital, Bern University Hospital, University of Bern, Bern, Switzerland; and
4. Department of Clinical Neurophysiology, University Hospital of Bellvitge, Barcelona, Spain.