1 Biomedical Engineering Group, University of Valladolid, Valladolid, Spain.
2 Centro de Investigación Biomédica en Red en Bioingeniería, Biomateriales y Nanomedicina, (CIBER-BBN), Valladolid, Spain.
3 IMUVA, Instituto de Investigación en Matemáticas, University of Valladolid, Valladolid, Spain.
4 Department of Mechanical Engineering Sciences, Faculty of Engineering and Physical Sciences, Centre for Biomedical Engineering, University of Surrey, Guildford, United Kingdom.