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. Department of Psychiatry and Behavioral Medicine, University of Washington, Seattle, Washington, USA;
7. Hospital Emergencia, Dr. Clemente Alvarez, Rosario, Argentina;
8. Centro de Informatica e Investigacion Clinica, Rosario, Argentina;
9. Medicina Intensiva, Hospital Nacional Professor Alejandro Posadas, Buenos Aires, Argentina;
10. Hospital General San Juan de Dios, Guatemala City, Guatemala;
11. Hospital de Emergencias Pediátricas, Lima, Peru;
12. Escuela de Medicina, Universidad Peruana de Ciencias Aplicadas, Lima, Peru
13. Instituto Nacional de Salud del Niño - San Borja, Lima, Peru;
14. Hospital Edgardo Rebagliati Martins, Lima, Peru;
15. Hospital Regional de Esquintla, Esquintla, Guatemala;
16. Hospital Regional de Occidente San Juan de Dios, Quetzaltenango, Guatemala;
17. Hospital Escuela Universitario, Tegucigalpa, Honduras;
18. Hospital de Niños Benjamín Bloom, San Salvador, El Salvador;