[1] Santa Maria Misericordia Hosp, Perugia, Italy
[2] Univ Perugia, Dept Elect & Informat Engn, I-06100 Perugia, Italy
[3] Univ Perugia, Dept Clin & Expt Med, I-06100 Perugia, Italy
[4] Univ Perugia, Dept Thorac Surg, I-06100 Perugia, Italy
[5] Univ Perugia, Inst Pathol Anat & Histol, I-06100 Perugia, Italy