1. Department of Dermatology; Turku University Hospital; 20521 Turku Finland
2. Department of Dermatology; Finnish Institute of Occupational Health, Control of Hypersensitivity Diseases; 00250 Helsinki Finland
3. Department of Dermatology; Skin and Allergy Hospital, 00290 Helsinki University Central Hospital; Helsinki Finland
4. Department of Dermatology; Allergy Centre, North Carelia Central Hospital, 80210; Joensuu Finland
5. Department of Dermatology; Tampere University Hospital; 33521 Tampere Finland
6. Department of Dermatology; Central Hospital of Keski-Pohjanmaa; 67200 Kokkola UK
7. Department of Dermatology; Kuopio Unievrsity Hospital, 70211; Kuopio Finland
8. Department of Dermatology; Central Hospital, Päijät-Häme Social and Health Care Group; 15850 Lahti Finland
9. Department of Dermatology; Oulu University Hospital; 90029 Helsinki Finland