1. Department of Electrical and Systems Engineering, Universidad de León, Campus de Vegazana, s/n, 24071 León, Spain
2. Department of Computer Science, Universidad de Oviedo, C/Calvo Sotelo, s/n, 33007 Oviedo, Spain
3. SALBIS Research Group, Facultad de Ciencias de la Salud, Campus de Ponferrada, Avda Astorga, s/n, Ponferrada, 24402 León, Spain
4. GIGAS Research Group, Facultad de Ciencias de la Salud, Campus de Vegazana, s/n, 24071 León, Spain