1 Department of Public Health and Community Medicine, Institute of Medicine, The Sahlgrenska Academy, University of Gothenburg, Gothenburg, Sweden; Research Unit and Section for General Practice, FoUU-centrum Fyrbodal, Vänersborg, Sweden. Electronic address: minna.johansson@vgregion.se.
2 The Nordic Cochrane Centre, Rigshospitalet, Copenhagen, Denmark.
3 Research Unit for General Practice and Section of General Practice, Department of Public Health, University of Copenhagen, Copenhagen, Denmark.