1Multidisciplinary Pain Centre, University Hospital Rigshospitalet 7612, Copenhagen Ø, Denmark
2Department of Palliative Medicine and Department of Anaesthesiology, RWTH Aachen University Hospital, Aachen, Germany
3National Institute of Public Health, Copenhagen K, Denmark
4Danish Breast Cancer Cooperative Group, DBCG Secretariat, Copenhagen, Denmark
5Department of Palliative Medicine, Bispebjerg Hospital, Copenhagen NV, Denmark
6Institute of Public Health, Department of Health Services Research, University of Copenhagen, Copenhagen K, Denmark
7Department of Surgery P, Aarhus University Hospital, Aarhus C, Denmark