1. University of Groningen, University Medical Centre GroningenDepartment of Dermatology 9700 RB Groningen The Netherlands
2. Department of Medical Informatics, Biometry and EpidemiologyUniversity of Erlangen/Nürnberg 91054 Erlangen Germany
3. Department of DermatologyUniversity Allergy Centre, University Hospital Carl Gustav Carus, Technical University of Dresden 01307 Dresden Germany
4. Dermatology Unit, Department of PaediatricsUniversity of Padova 35137 Padova Italy
5. Allergy Unit, Department of DermatologyUniversity Hospital 4031 Basel Switzerland
6. Dermatology DepartmentUniversity of Medical Sciences 60‐355 Poznan Poland
7. Department of DermatologyUniversity Medical Centre Maribor 2000 Maribor Slovenia
8. Department of DermatologyUniversity Hospital Jena 07743 Jena Germany
9. Section of Dermatology, DISSAL – Department of Health SciencesUniversity of Genoa 16132 Genoa Italy
10. Department of DermatologyNinewells Hospital and Medical School Dundee DD1 9SY UK
11. Department of DermatologyHospital del Mar. Universitat Autònoma and Pompeu Fabra 08003 Barcelona Spain
12. Department of DermatologyLeicester Royal Infirmary Leicester, LE1 5WW, UK
13. Faculty of Medicine and Health ScienceThe Jan Kochanowski University 25‐317 Kielce Poland
14. Unit of Occupational MedicineUniversity of Trieste 34129 Trieste Italy
15. Department of DermatologyFree University of Amsterdam 1081 HV Amsterdam The Netherlands
16. Dermatology DepartmentHospital Universitario de la Princesa, Instituto de Investigación Sanitaria la Princesa (IIS‐IP) 28006 Madrid Spain
17. Information Network of Departments of Dermatology at the University of Göttingen 37075 Göttingen Germany
18. Department of DermatologyInselspital, Bern University Hospital, University of Bern 3010 Bern Switzerland
19. Department of Experimental Dermatology and CosmetologyJagiellonian University Medical College 30‐688 Krakow Poland
20. Department of DermatologyCentre Hospitalier Universitaire Vaudois 1011 Lausanne Switzerland
21. Department of DermatologyHospital of Pordenone 33170 Pordenone Italy
22. Department of Skin and Venereal DiseasesLithuanian University of Health Sciences 44307 Kaunas Lithuania
23. Lithuanian University of Health Sciences Hospital 50009 Kaunas Lithuania
24. Dermatovenerološka ambulanta 6310 Izola Slovenia
25. Department of Clinical Social Medicine, Occupational and Environmental DermatologyUniversity Hospital Heidelberg 69117 Germany
26. Dermatology, Leeds Teaching Hospitals NHS Trust Leeds LS7 4SA UK
27. Graz, AT
28. Luzern, CH
29. Aarau, CH
30. Dortmund, DE
31. Kiel, DE
32. Göttingen, DE
33. Ösnabruck, DE
34. Erlangen, DE
35. Helsinki, FI
36. Lahti, FI
37. Cádiz, ES
38. Santiago de Compostela, ES
39. Vigo, ES
40. Murcia, ES
41. León, ES
42. Alicante, ES
43. Napoli, IT
44. Padova, IT
45. Kaunas, LT
46. Łodz, PL
47. Celje, SI
48. Maribor/Clinic, SI
49. Ljubljana/Clinic, SI
50. Ljubljana/Univ., SI
51. Novo Mesto, SI
52. Cardiff, UK
53. Oxford, UK
54. Nottingham, UK
55. Middlesbrough, UK
56. Sheffield, UK
57. Dundee, UK
58. Liverpool, UK
59. Aberdeen, UK
60. Bristol, UK
61. Swansea, UK
62. Newport, UK
63. London, UK