1. Department of Cardiology; Gentofte Hospital, University of Copenhagen; Gentofte Denmark
2. Department of Biostatistics; University of Copenhagen; Copenhagen Denmark
3. The Heart Centre; Department of Cardiology; Rigshospitalet Copenhagen Denmark
4. Institute of Health, Science and Technology; Aalborg University; Aalborg Denmark
5. University of Birmingham Centre for Cardiovascular Sciences; City Hospital; Birmingham UK
6. The National Institute of Public Health; University of Southern Denmark; Odense Denmark