1. Department of Pathology & Cell Biology, Columbia University Medical Center, New York, New York, United States of America
2. Department of Neurosurgery, Ulm University Medical Center, Ulm, Germany
3. Department of Pediatrics and Adolescent Medicine, Ulm University Medical Center, Ulm, Germany
4. Department of Neurological Surgery, Columbia University Medical Center, New York, New York, United States of America