1. Department of Dermatology; University Hospital of Tours; University Francois Rabelais; Tours France
2. ISP 1282 INRA-University of Tours; Tours France
3. Division of Dermatology; Department of Medicine; J.H. Stroger Jr Hospital of Cook County; 1900 West Polk Street Chicago IL 60612 U.S.A.
4. Department of Dermatology; Rush University Medical Center; 1900 West Polk Street Chicago IL 60612 U.S.A.
5. Centre of Evidence Based Dermatology; King's Meadow Campus; Lenton Lane Nottingham NG7 2NR U.K.
6. Department of Dermatology; Churchill Hospital; Oxford OX3 7LE U.K.