[1] Hosp del Mar, Dept Surg, Barcelona, Spain
[2] Hosp Clin Univ Lozano Blesa, Dept Surg A, Zaragoza, Spain
[3] Univ Politecn Valencia, Dept Elect Engn, E-46071 Valencia, Spain
[4] Univ Zaragoza, Dept Elect Engn & Commun, Zaragoza, Spain
[5] Univ Zaragoza, Fac Vet, Dept Anim Pathol & Surg, Zaragoza, Spain
[6] Hosp Clin Univ Lozano Blesa, Dept Pathol, Zaragoza, Spain
[7] CSIC, Inst Biomed Valencia, Valencia, Spain