1. Department of Medicine, Medical Microbiology Section, University of Perugia, Perugia, Italy
2. Department of Experimental Medicine, University of Perugia, Perugia, Italy
3. Lesaffre International, Lesaffre Group, Marcq-en-Baroeul, France
4. Internal Medicine, Department of Veterinary Medicine, University of Perugia, Perugia, Italy
5. Lesaffre Human Care, Lesaffre Group, Marcq-en-Baroeul, France