1. Department of Oral and Maxillofacial Diseases, University of Helsinki, Helsinki University Central Hospital, Helsinki, Finland
2. Department of Pediatric Heart Surgery and Organ Transplantation, New Children’s Hospital, Helsinki University, Helsinki, Finland
3. Unit of Periodontology, Oral Health Sciences Centre, Post Graduate Institute of Medical Education & Research, Chandigarh, India
4. Division of Periodontology, Department of Dental Medicine, Karolinska Institutet, Huddinge, Sweden