1. Department of Clinical and Experimental Medicine, Division of Infectious Diseases, University of Bologna "Alma Mater Studiorum," S. Orsola-Malpighi Hospital, Bologna, Italy.
2. Clinical Department of Radiological and Histocytopathological Sciences, Division of Pathology, University of Bologna "Alma Mater Studiorum," S. Orsola-Malpighi Hospital, Bologna, Italy.