1. Elective Surgery Centre, Silkeborg Regional Hospital, Falkevej 1-3, 8600 Silkeborg, Denmark
2. DEFACTUM, Public Health and Health Services Research, Olof Palmes Allé 15, 8200 Aarhus N, Denmark
3. Department of Clinical Medicine, Aarhus University, Palle Juul-Jensens Blvd. 82, 8200 Aarhus N, Denmark
4. Interacting Minds Centre, Department of Clinical Medicine, Aarhus University, Jens Chr. Skous Vej 4-1483, 8000 Aarhus C, Denmark