1. University of Aberdeen Dental School and Hospital, Aberdeen AB25 2ZR, U.K.
2. Institute
of Medical Sciences, University of Aberdeen, Aberdeen AB25 2ZD, U.K.
3. Department of Pathology, School of Medicine & Dentistry, University of Aberdeen, Aberdeen AB25 2ZD, U.K.
4. Mucosal Infection & Immunity Group, Section of Infectious Diseases, Imperial College, London W2 1PG, U.K.
5. Mucosal & Salivary Biology, King’s College London, Dental Institute, London SE1 1UL, U.K.
6. Laboratory
of Molecular Microbiology and Biotechnology, Department of Medical
Biotechnologies, University of Siena, Siena 53100, Italy