1 Research Group on Gene-Environment Interactions and Health (GIIGAS), Faculty of Health Sciences, Institute of Biomedicine (IBIOMED), Universidad de León, Vegazana Campus, 24071, Spain. Electronic address: tferv@unileon.es.
2 Department of Nursing and Physiotherapy, Faculty of Health Sciences, Universidad de León, Vegazana Campus, Campus de Vegazana, León 24071, Spain. Electronic address: ana.vazquez@unileon.es.
4 Animal Health Departament, Faculty of Veterinary, Universidad de León, Vegazana Campus, León 24071, Spain. Electronic address: amcaru@unileon.es.
5 Research Group on Gene-Environment Interactions and Health (GIIGAS), Faculty of Health Sciences, Institute of Biomedicine (IBIOMED), Universidad de León, Vegazana Campus, 24071, Spain; Consortium for Biomedical Research in Epidemiology and Public Health (CIBER en Epidemiología y Salud Pública-CIBERESP), Madrid, Spain. Electronic address: vicentemartin@unileon.es.