Edit Osman Elrayah Mustafa Osman Position PhD candidate Affiliation Department of Clinical Dentistry E-mail osman.osman@uib.no Visitor address Ã…rstadveien 195009 Bergen Postal address P.O. Box 7804 NO-5020 Bergen Norway Osman Elrayah Mustafa Osman Position PhD candidate Affiliation Department of Clinical Dentistry