[1] Aarhus Univ Hosp, Dept Internal Med & Endocrinol, Aarhus N, Denmark
[2] Aalborg Univ Hosp, Dept Clin Biochem, Aalborg, Denmark
[3] Aalborg Univ, Dept Clin Med, Fac Med, Aalborg, Denmark
[4] Aarhus Univ Hosp, Steno Diabet Ctr Aarhus, Aarhus N, Denmark