1. Department of Neurological Surgery, University of Washington, Seattle, Washington, USA
2. Department of Orthopaedic Surgery, University of Washington, Seattle, Washington, USA
3. School of Global Health, University of Washington, Seattle, Washington, USA
4. Harborview Medical Center, University of Washington, Seattle, Washington, USA
5. Department of Biostatistics, University of Washington, Seattle, Washington, USA
6. Medicina Intensiva, Hospital Nacional Professor Alejandro Posadas, Buenos Aires, Argentina
7. Department of Psychiatry and Behavioral Medicine, University of Washington, Seattle, Washington, USA
8. Hospital Emergencia, Dr. Clemente Alvarez, Rosario, Argentina
9. Centro de Informatica e Investigacion Clinica, Rosario, Argentina
10. Hospital General San Juan de Dios, Guatemala City, Guatemala