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by Koch, Goran; Poulsen, Sven; Espelid, Ivar; et al.
by Goran Koch (Department of Pediatric Dentistry, The Institute for Postgraduate Dental Education, Sweden); Sven Poulsen (Department of Community Oral Health and Pediatric Dentistry, University of Aarhus, Denmark)
by Koch, Goran; Poulsen, Sven