1 Internal Medicine Unit, Sant'Antonio Abate Hospital, Azienda Sanitaria Universitaria Friuli Centrale, Tolmezzo, Italy.
2 Department of Clinical and Experimental Medicine, Infectious Diseases Unit, Azienda Ospedaliera Universitaria Pisana, University of Pisa, Pisa, Italy.
3 Institute of Clinical Pathology, Sant'Antonio Abate Hospital, Azienda Sanitaria Universitaria Friuli Centrale, Tolmezzo, Italy.
4 Institute of Pathology, University Hospital of Udine, Udine, Italy.
5 Infectious Diseases Unit, Trieste University Hospital (ASUGI), Trieste, Italy.
6 Clinical Department of Medical, Surgical and Health Sciences, Trieste University, Trieste, Italy.