1. Department of Dermatology; Amsterdam University Medical Centers, University of Amsterdam; Amsterdam Netherlands
2. St John's Institute of Dermatology; Guy's and St Thomas' NHS Foundation Trust; London UK
3. Centre of Evidence Based Dermatology; University of Nottingham; Nottingham UK
4. Cochrane Skin, Centre of Evidence Based Dermatology; University of Nottingham; Nottingham UK
5. Department of Medicine; University of Toronto; Toronto Canada
6. Women's College Research Institute; Women's College Hospital; Toronto Canada
7. Photobiology Unit, Dermatology Department; University of Dundee, Ninewells Hospital and Medical School; Dundee UK
8. Department of Dermatology; HagaZiekenhuis van Den Haag; Den Haag Netherlands
9. Department of Dermatology; Antonius Ziekenhuis; Sneek/Emmeloord Netherlands
10. Medical Library; Amsterdam UMC, University of Amsterdam; Amsterdam Netherlands
11. National Heart & Lung Institute, Section of Inflammation and Repair; Imperial College London; London UK