1. Department of Dermatology; Rotherham District General Hospital; Moorgate Road Rotherham S60 2UD U.K
2. Department of Dermato-Allergology; National Allergy Research Centre; Copenhagen University Hospital Gentofte; Niels Andersensvej Hellerup DK-2900 Denmark
3. Department of Medical Informatics, Biometry and Epidemiology; University of Erlangen/Nürnberg; D-91054 Erlangen Germany
4. Information Network of Departments of Dermatology; University Medicine Göttingen; D-37075 Göttingen Germany
5. Paediatric Dermatology Unit; Department of Medicine; University of Padua; Via Giustiniani 3 35128 Padua Italy
6. Department of Dermatology; Abertawe Bromorgannwg University NHS Trust; Swansea SA2 8QA U.K
7. Department of Dermatology; Royal Hallamshire Hospital; Sheffield S10 2JF U.K