1. Department of Biomedical Sciences, University of Sassari, Sassari, Italy
2. Biosciences Institute, Faculty of Medical Sciences, Newcastle University, Newcastle upon Tyne, United Kingdom
3. Mediterranean Center for Disease Control (MCDC), Sassari, Italy
4. Department of Microbiology and Immunology, School of Medicine, Virginia Commonwealth University, Richmond, Virginia, USA
5. Department of Obstetrics and Gynecology, School of Medicine, Virginia Commonwealth University, Richmond, Virginia, USA
6. Center for Microbiome Engineering and Data Analysis, Virginia Commonwealth University, Richmond, Virginia, USA