Edit Siv Lise Bedringaas Affiliation Faculty of Medicine Department of Clinical Science E-mail siv.bedringaas@uib.no Visitor address Haukeland universitetssykehus, Laboratoriebygget5009 Bergen Postal address P.O. Box 7804 NO-5020 Bergen Norway Siv Lise Bedringaas Affiliation Faculty of Medicine Department of Clinical Science