1. John A. Burns School of Medicine, University of Hawaii at Manoa, Honolulu, Hawaii, United States
2. Department of Neurological Surgery, UC Irvine, Irvine, California, United States
3. Keck School of Medicine of USC, Los Angeles, California, United States
4. Department of Neurological Surgery, UCSD, La Jolla, California, United States
5. Department of Neurosurgery, Oregon Health Sciences University, Oregon, United States