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[\'Department of Oral and Maxillofacial Diseases, Helsinki University and University Hospital, Helsinki, Finland. Electronic address: ismo.raisanen@helsinki.fi.\', \'Department of Preventive Dentistry, Faculty of Dental Sciences, College of Medicine, University of Lagos, Lagos, Nigeria.\', \'Department of Oral and Maxillofacial Diseases, Helsinki University and University Hospital, Helsinki, Finland.\', \'Department of Preventive and Community Dentistry, Obafemi Awolowo University, Ile-Ife, Nigeria.\', \'Department of Periodontology, 424 General Army Hospital, Thessaloniki, Greece; Department of Preventive Dentistry, Periodontology, and Implant Biology, Aristotle University of Thessaloniki, Thessaloniki, Greece.\', \'Department of Preventive Dentistry, Periodontology, and Implant Biology, Aristotle University of Thessaloniki, Thessaloniki, Greece.\', \'Department of Oral and Maxillofacial Diseases, Helsinki University and University Hospital, Helsinki, Finland; Department of Oral Diseases, Karolinska Institutet, Huddinge, Sweden.\']
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