1. Department of Public Health; Aarhus University; Horsens Hospital Research Unit; Horsens Denmark
2. Department of Public Health; Aarhus University; Aarhus University Hospital; Denmark
3. Department of Public Health; Aarhus University; Denmark
4. Faculty of Health and Sports; University of Agder; Kristiansand Norway
5. Research Unit; Sørlandet hospital; Kristiansand Norway
6. Aarhus University Hospital; Denmark
7. University of Witten/Herdecke; Germany