[1] University of Helsinki and Helsinki University Hospital,Department of Oral and Maxillofacial Diseases
[2] University of Eastern Finland,Department of Health and Social Management
[3] Helsinki and Uusimaa Hospital District,Department of Public Health
[4] Administration,Department of Oral and Maxillofacial Surgery
[5] University of Helsinki,Department of Oral and Maxillofacial Diseases
[6] University of Turku,undefined
[7] Turku University Hospital,undefined