1. Danish Research Centre of Magnetic Resonance, Section 340, H:S Hvidovre Hospital; University of Copenhagen; Kettegaard Allé 30 DK-2650 Hvidovre Denmark
2. Department of Cardiology and Endocrinology; H:S Frederiksberg Hospital, University of Copenhagen; Copenhagen Denmark
3. Department of Medical Physiology; the Panum Institute, University of Copenhagen; Copenhagen Denmark
4. Department of Clinical Physiology and Nuclear Medicine, H:S Rigshospitalet; University of Copenhagen; Copenhagen Denmark