1. Environmental and Labor Health Group, Research in Public Health Direction, National Institute of Health, Bogotá DC, Colombia
2. Health Sciences School, Universidad del Rosario, Bogotá DC, Colombia
3. National Institute of Health, Bogota DC, Colombia
4. School of Optometry, Universidad Santo Tomás, Bucaramanga, Colombia
5. Public Health Department, School of Medicine, Universidad Industrial de Santander, Bucaramanga, Colombia
6. Occupational Health Program, Universidad Manuela Beltrán, Bucaramanga, Colombia