1. Department of Biochemistry, University of Turku, Turku, Finland
2. Department of Virology, University of Helsinki, Helsinki, Finland
3. Department of Oral and Maxillofacial Surgery, Helsinki University Hospital, Helsinki, Finland
4. Institute of Dentistry, University of Turku, Turku, Finland
5. Institute of Technology, University of Tartu, Tartu, Estonia
6. Department of Biochemistry and Biophysics, Stockholm University, Stockholm, Sweden