aDepartment of Clinical Biochemistry, Nordsjællands Hospital, Hillerød

bThe Copenhagen General Population Study, Herlev and Gentofte Hospital, Herlev

cDepartment of Clinical Medicine, Faculty of Health and Medical Sciences, University of Copenhagen

dDepartment of Clinical Biochemistry, Rigshospitalet, Copenhagen, Denmark

Correspondence to Katrine L. Rasmussen, MD, PhD, Associate Professor, Staff Specialist, Department of Clinical Biochemistry, Nordsjællands Hospital, Dyrehavevej 29. DK-3400 Hillerød, Denmark. Tel: +45 2965 0558; e-mail: [email protected]