1. Department of Restorative Dentistry and Periodontology, Dublin Dental University Hospital, Trinity College, Dublin, Ireland;
2. Microbiology Research Unit, Division of Oral Biosciences, Dublin Dental University Hospital Trinity College, Dublin, Ireland;
3. Department of Health Sciences, Kristianstad University, Kristianstad, Sweden;
4. Blekinge Institute of Technology, Karlskrona, Sweden