1. Department of Endocrinology, Aarhus University Hospital , Aarhus N 8200 , Denmark
2. Department of Clinical Medicine, Aarhus University , Aarhus N 8200 , Denmark
3. Department of Molecular Medicine, Aarhus University Hospital , Aarhus N 8200 , Denmark
4. Cardiorespiratory Unit, Great Ormond Street Hospital for Children , London WC1N 3JH , UK
5. Department of Cardiology, Aalborg University Hospital , Aalborg 9000 , Denmark