1. Department of Odontology, Section of Pediatric Dentistry, Faculty of Medicine, Umeå University, SE-90185 Umeå, Sweden
2. Department of Odontology, Section of Cariology, Faculty of Medicine, Umeå University, SE-90185 Umeå, Sweden
3. Bristol Dental School, University of Bristol, Bristol BS8 2BN, UK
4. MRC Integrative Epidemiology Unit, Department of Population Health Sciences, Bristol Medical School, University of Bristol, Bristol BS8 2BN, UK
5. Department of Clinical Sciences, Section of Pediatric medicine, Faculty of Medicine, Umeå University, SE-90185 Umeå, Sweden