1. Faculty of Health Sciences, Universidad Católica del Maule, Talca, Chile
2. Faculty of Medicine, School of Public Health, Universidad de Chile, Santiago, Chile
3. Laboratory of Psychology, Faculty of Health Sciences, Universidad Católica del Maule, Talca, Chile
4. Department of Environmental Health, Rollins School of Public Health, Emory University, Atlanta, GA, USA
5. Health Ministerial Regional Secretariat of the Maule, Government of Chile, Talca, Chile
6. Regional Hospital of Talca, Chile
7. The Agricultural and Livestock Service of the Maule Region, Government of Chile, Talca, Chile