1. Department of Public Health Sciences, College of Health Sciences, University of Texas at El Paso, El Paso, TX 79968, USA
2. Human Immunology, Nutrition and Disease Research Laboratory, College of Health Sciences, University of Texas at El Paso, El Paso, TX 79968, USA
3. Center for Health Research and Evaluation, College of Health Sciences, University of Texas at El Paso, El Paso, TX 79968, USA
4. Proyecto Prometeo, Secretaría de Educación Superior, Ciencia y Tecnología (SENESCYT), Quito, Ecuador
5. Centro de Biomedicina, Facultad de Medicina, Universidad Central del Ecuador, Quito, Ecuador
6. Department of Internal Medicine, University of New Mexico, Albuquerque, NM 87131, USA
7. Department of Civil Engineering, College of Engineering, University of Texas at El Paso, El Paso, TX 79968, USA