作者单位：Health Centre of Oulu, 90015 Oulu, Finland[1]Specialist Denta Health Care Unit, City of Oulu, Oulu, Finland[2]Institute of Diagnostics, Department of Medical Microbiology and Immunology, University of Oulu[3]Department of Periodontology and Geriatric Dentistry, University of Oulu, Box 5281, 90014 Oulu[4]Medical Research Unit, Sein?joki Central Hospital, University of Tampere, Tampere 33520, Finland[5]
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