1. Occupational Health Research Unit, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
2. Division of Internal Medicine, Hospital Regional “Adolfo López Mateos”, Instituto de Seguridad y Servicios Sociales de los Trabajadores del Estado, Mexico City, Mexico
3. Division of Audiology, Hospital de Especialidades, Centro Médico Nacional Siglo XXI, Instituto Mexicano del Seguro Social, Mexico City, Mexico
4. Division of Research and Postgraduate Education, Claustro Universitario de Chihuahua, Chihuahua, Mexico
5. Public Health Department, Faculty of Medicine, Universidad Nacional Autónoma de México, Mexico City, Mexico
6. Department of Clinical Science, Intervention and Technology, Division of Audiology, Karolinska Institutet, Huddinge, Sweden