[1] Univ Turin, Dept Clin Physiopathol, I-10126 Turin, Italy
[2] Univ Turin, Dept Biomed Sci & Human Oncol, I-10126 Turin, Italy
[3] San Giovanni Battista Hosp, Dept Pathol Anat, Turin, Italy
[4] San Giovanni Battista Hosp, Dept Oncol, Turin, Italy
[5] San Giovanni Battista Hosp, Dept Gastroenterol & Clin Nutr, Turin, Italy
[6] Univ Verona, Dept Pathol, I-37100 Verona, Italy
[7] Thomas Jefferson Univ, Dept Dermatol, Philadelphia, PA 19107 USA