1. Department of Paediatric and Preventive Dentistry, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia.
2. Unit of Oral Medicine and Periodontology, Division of Stomatology, University Medical Centre Ljubljana, Ljubljana, Slovenia.
3. Department of Haematology and Oncology, University Children's Hospital, Ljubljana, Slovenia.
4. Department of Oral Medicine and Periodontology, Faculty of Medicine, University of Ljubljana, Ljubljana, Slovenia.