1. Department of Medicine; Silkeborg Hospital & Institute of Clinical Medicine, Aarhus University Hospital; Aarhus Denmark
2. Department of Medicine; School of Medicine and Department of Epidemiology; School of Public Health; Boston University; Boston Massachusetts USA
3. Research Unit for General Practice; Aarhus University; Aarhus Denmark
4. Hammel Neurorehabilitation and Research Centre; Hammel Denmark
5. Institute of Cancer Epidemiology, Danish Cancer Society; Copenhagen Denmark
6. Section for Epidemiology; Department of Public Health; Aarhus University; Aarhus Denmark
7. Department of Cardiology; Center for Cardiovascular Research; Aalborg Hospital; Aalborg University Hospital; Aalborg Denmark