1. Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark
2. Department of Epidemiology, Fielding School of Public Health, University of California, Los Angeles
3. Clinical Epidemiology Unit, Department of Medicine (Solna), Karolinska University Hospital, Karolinska Institute, Stockholm, Sweden
4. Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark2Department of Epidemiology, Fielding School of Public Health, University of California, Los Angeles
5. Research Unit for General Practice, Section for General Medical Practice, Department of Public Health, Aarhus University, Aarhus, Denmark
6. Institute of Child Health and Administrative Data Research, Centre for England, University College London, London, England
7. Section for Biostatistics, Department of Public Health, Aarhus University, Aarhus, Denmark
8. Department of Biostatistics, School of Public Health, Fudan University, Shanghai, China