1. Public Health, Department of Medicine and Surgery, University of Perugia, Perugia, Italy
2. Department and Institute of Microbiology, Saarland University Hospital, Homburg, Germany
3. Public Health and Preventive Medicine, Salento University, Lecce, Italy
4. Foundation for the Promotion of Health and Biomedical Research of the Valencian Region, Valencia, Spain
5. University of Nottingham School of Medicine, Nottingham, UK