1. Servicio de Otorrinolaringología, Hospital Barros Luco-Trudeau, Santiago, Chile
2. Departamento de Otorrinolaringología, Facultad de Medicina, Universidad de Chile, Santiago, Chile
3. Unite of Research, Hospital Barros Luco Trudeau, Santiago, Chile
4. Department of Global Health, School of Public Health, Universidad de Chile, Santiago, Chile