1. Department of Epidemiology, Harvard T.H. Chan School of Public Health, Boston, MA 02115, USA
2. Departamento de Rehabilitación, Hospital del Trabajador, Asociación Chilena de Seguridad, Santiago 8320000, Chile
3. Department of Psychiatry, Harvard Medical School, Boston, MA 02115, USA
4. The Chester M. Pierce, MD Division of Global Psychiatry, Massachusetts General Hospital, Boston, MA 02114, USA