1. Departments of Clinical Physiology (K.B.H.), Gentofte Hospital, Copenhagen, Denmark
2. Glostrup Hospital; Biomedical Sciences (K.B.H., J.J.H.), the Panum Institute;, Gentofte Hospital, Copenhagen, Denmark
3. University of Copenhagen and Internal Medicine F (T.V., J.I.B., F.K.K.), Gentofte Hospital, Copenhagen, Denmark