1. Department of Optics, Faculty of Science; University of Granada, Campus Fuente Nueva, Edificio Mecenas, s/n 18071; Granada Spain
2. Department of Restorative Dentistry and Prosthodontics, Houston Center for Biomaterials and Biomimetics (HCBB); University of Texas School of Dentistry at Houston, 7500 Cambridge St., Ste. 5350; Houston Texas
3. Department of Computer Architecture and Computer Technology; E.T.S.I.I.T. University of Granada, s/n 18071; Granada Spain