1. Department of Dermatology; Hôpital Henri Mondor; Créteil France
2. Epidemiology in Dermatology and Evaluation of Therapeutics (EpiDermE) - EA 7379; Université Paris Est Créteil (UPEC); Créteil France
3. Clinical Investigation Centre; Hôpital Henri Mondor; Créteil France
4. Université de Paris, Centre of Research in Epidemiology and Statistics (CRESS), INSERM, F-75004; Paris France
5. Cochrane France; Paris France
6. Department of Dermatology; Complexo Hospitalario Universitario de Vigo; Vigo Spain
7. Centre of Evidence Based Dermatology; Cochrane Skin Group, The University of Nottingham; Nottingham UK
8. Division of Evidence Based Medicine, Department of Dermatology, Venerology and Allergology; Charité - Universitätsmedizin Berlin, corporate member of Freie Universität Berlin, Humboldt-Universität zu Berlin, and Berlin Institute of Health; Berlin Germany
9. c/o Cochrane Skin Group; The University of Nottingham; Nottingham UK
10. Centro Studi GISED (Italian Group for Epidemiologic Research in Dermatology) - FROM (Research Foundation of Ospedale Maggiore Bergamo); Padiglione Mazzoleni - Presidio Ospedaliero Matteo Rota; Bergamo Italy