1. Departamento de Salud, Universidad Internacional Iberoamericana, Campeche 24560, Mexico
2. Faculty of Health Sciences, Universidad Europea del Atlántico, 39011 Santander, Spain
3. Institute of Secondary Education José del Campo, 39849 Ampuero, Spain
4. Faculty of Teacher Training, Universidade de Santiago de Compostela, 27001 Lugo, Spain