Conflicts of interest ED has declared the following conflict of interest: Advisory board member, consultant, grants, research support, participation in clinical trials, honorarium for speaking and research support with the following pharmaceutical companies: Abbott, Astellas, Biogen, Galderma, Glaxo, Janssen‐Cilag, Leo Pharma, Merck‐serono, Novartis, Schering‐Plough, Stiefel, Wyeth Pharmaceuticals, 3M. C.E.M.G. has received research support or has acted as a consultant or lecturer for Abbott, Amgen, Biogem‐IDEC, Centoocor, Essex Pharma, Galderma, Leo Pharma, Novartis, Novo Nordisk, Schering Plough, Merck‐Serono, Stiefel, UCB Pharma and Wyeth. KK has acted as consultant/speaker and/or investigator for Abbott, Janssen‐cilag, Leo Pharma, Merck‐Serono, Novo Nordisk, Schering‐Plough and Wyeth. MS received grant/prize from Wyeth. All other authors declare that they have no conflict of interest. For my patients I would like to dedicate this article to Alice, Eloi, Magali, Robert and all my psoriatic patients, without whom the following discussions would not have been so interesting and diverse. Louis Dubertret
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