1. Odense University Hospital and University of Southern Denmark; Center for Evidence-Based Medicine; Sdr. Boulevard 29, Gate 50 (Videncenteret) Odense Denmark 5000
2. Rigshospitalet; Nordic Cochrane Centre; Blegdamsvej 9 Copenhagen Denmark 2200
3. Hvidovre Hospital; Department of Infectious Diseases; Kettegård Allé 30 Hvidovre Denmark 2650
4. Imperial College London; Primary Care and Public Health; The Reynolds Building St Dunstans Road London UK W6 8RP