1. Department of Morphology Surgery and Experimental Medicine, Section of Pathology, Oncology and Experimental Biology, University of Ferrara Ferrara Italy
2. Institute for Maternal and Child Health – IRCCS “Burlo Garofolo” Trieste Italy
3. Department of Medical Science University of Trieste Trieste Italy
4. Clinical Laboratory Analysis, University Hospital of Ferrara Ferrara Italy
5. UMR INRA ISP, Team Biologie des infections à polyomavirus, University de Tours Tours France