1. Department of Pathology University of Helsinki and Helsinki University Central Hospital Helsinki Finland
2. Department for Oral Health and Medicine and Center of Salivary Diagnostics and Hyposalivation UZB University Centre for Dental Medicine Basel, University of Basel Basel Switzerland
3. Department of Public Health University of Helsinki Helsinki Finland
4. Department of Oral and Maxillofacial Diseases Helsinki University Central Hospital, Institute of Dentistry Helsinki Finland
5. Department of Oral Diseases Karolinska Institutet Huddinge Sweden