1. Department of Neurosurgery, and Keck School of Medicine, University of Southern California, Los Angeles, California, USA.
2. Department of Psychiatry, Keck School of Medicine, University of Southern California, Los Angeles, California, USA.
3. Department of Neurosurgery, UCSF School of Medicine, San Francisco, California, USA.
4. Department of Neurosurgery, Medical University of Vienna, Vienna, Austria.