1. Haartman Institute; Medicum; University of Helsinki; Helsinki Finland
2. Department of Public Health; University of Helsinki; Helsinki Finland
3. Allergy Centre; Tampere University Hospital; Tampere Finland
4. HUSLAB; Helsinki University Hospital; Helsinki Finland
5. Living Environment and Health Unit; National Institute for Health and Welfare; Kuopio Finland
6. Skin and Allergy Hospital; Hospital District of Helsinki and Uusimaa; Helsinki University Hospital and University of Helsinki; Helsinki Finland