1. Department of Environmental and Occupational Health, School of Public Health, Texas A&M University, 212 Adriance Lab Road, College Station, TX 77843, USA
2. Hospital Regional de Alta Especialidad de la Peninsula de Yucatan IMSS-BIENESTAR, Calle 7 #433 X20 y 22 Fracc, Altabrisa, Mérida 97130, Yucatán, Mexico
3. Sciences of Health Faculty, Montemorelos University, Libertad 1300 Pte., Montemorelos 67500, Nuevo Leon, Mexico
4. Facultad de Medicina, Departamento de Biología Celular y Ultraestructura, Universidad Autónoma de Coahuila, Avenida Morelos 900 Oriente, Primero de Cobian, Centro, Torreón 27000, Coahuila, Mexico