1. University of Copenhagen; The Research Unit for General Practice and Section of General Practice, Department of Public Health; Øster Farimagsgade 5 Copenhagen Denmark 1014
2. Rigshospitalet, University of Copenhagen; CHIP, Department of Infectious Diseases and Rheumatology, Finsencentret; Blegdamsvej 9, DK-2100 Copenhagen Denmark DK-2100
3. Rigshospitalet; The Nordic Cochrane Centre; Blegdamsvej 9, 7811 Copenhagen Denmark 2100
4. Department of Public Health, University of Copenhagen; Section of General Practice; CSS, Øster Farimagsgade 5 Copenhagen Denmark DK-1014