264 Zeinab Cheaib <str<strong>on</strong>g>and</str<strong>on</strong>g> Adrian Lussi Acknowledgements This study was supported by the University Of Bern, Switzerl<str<strong>on</strong>g>and</str<strong>on</strong>g>. We would like to thank Dr Stefanie Hayoz, Institute <str<strong>on</strong>g>of</str<strong>on</strong>g> Mathematical Statistics, University <str<strong>on</strong>g>of</str<strong>on</strong>g> Bern, for the statistical analysis <str<strong>on</strong>g>and</str<strong>on</strong>g> Dr Ekaterina Rakhmatullina, Department <str<strong>on</strong>g>of</str<strong>on</strong>g> Preventive, Restorative <str<strong>on</strong>g>and</str<strong>on</strong>g> Pediatric Dentistry, University <str<strong>on</strong>g>of</str<strong>on</strong>g> Bern, for help with revisi<strong>on</strong>s <str<strong>on</strong>g>of</str<strong>on</strong>g> the manuscript. 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