1. 1Directorate of Teaching and Research, Institute of Public Health from Guanajuato State, Guanajuato, México.
2. 2Directorate of Health Services, Institute of Public Health from Guanajuato State, Guanajuato, México
3. 3State Laboratory of Public Health, Institute of Public Health from Guanajuato State, Leon, México.
4. 5Department of Research and Technological Development, Directorate of Teaching and Research, Institute of Public Health from Guanajuato State, Guanajuato, Mexico.