Institution: | 1. Department of Oral and Maxillofacial Surgery, Helsinki University Central Hospital, University of Helsinki, Helsinki, Finland;2. Institute of Dentistry, University of Eastern, Finland;3. Department of Oral and Maxillofacial Surgery, Kuopio University Hospital, Kuopio, Finland;4. Department of Environmental Health, National Institute for Health and Welfare, Kuopio, Finland;5. Department of Anesthesia and Intensive Care Unit, Helsinki University Central Hospital, Helsinki, Finland |