作者单位：Department of Preventive, Restorative and Pediatric Dentistry, University of Bern, Freiburgstrasse[1]Department of Paediatric Dentistry, Faculty of Dentistry, Hacettepe University, Ankara, Turkey[2]Mühlegasse 22, 3400 Burgdorf, Switzerland[3]Department of Conservative and Preventive Dentistry, Dental Clinic, Justus Liebig University[4]
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