1. Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA
2. Department of Neurosurgery, Warren Alpert Medical School of Brown University, Providence, Rhode Island, USA
3. Department of Neurological Surgery, University of Washington School of Medicine, Seattle, Washington, USA
4. Department of Medicine, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
5. Yale School of Public Health, Yale University, New Haven, Connecticut, USA