1 Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus University, 8200 Aarhus, Denmark; National Centre for Register-based Research, Aarhus University, 8200 Aarhus, Denmark.
2 Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus University, 8200 Aarhus, Denmark.
3 Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus University, 8200 Aarhus, Denmark. Electronic address: [email protected].