1. Research Unit for General Practice, Department of Public Health, Aarhus University, Aarhus, Denmark
2. National Centre for Register-Based Research, Department of Economics and Business, Aarhus University, Aarhus, Denmark
3. Section for General Medical Practice, Department of Public Health, Aarhus University, Aarhus, Denmark
4. Department of Psychiatry and Behavioral Sciences, School of Public Health, University of Washington, Seattle
5. Research Unit for General Practice, Department of Public Health, Aarhus University, Aarhus, Denmark3Section for General Medical Practice, Department of Public Health, Aarhus University, Aarhus, Denmark