1. Department of Biosciences; University of Helsinki; Helsinki Finland
2. Department of Health; National Institute for Health and Welfare; Helsinki Finland
3. Institute of Public Health and Clinical Nutrition; University of Eastern Finland; Kuopio Finland
4. Skin and Allergy Hospital; Helsinki University Central Hospital & University of Helsinki; Helsinki Finland
5. North Karelia Centre for Public Health; Joensuu Finland
6. Petrozavodsk State University; Petrozavodsk Russia
7. Hoiku Rehabilitation Centre; Hamina Finland
8. Institute of Biotechnology; University of Helsinki; Helsinki Finland
9. Institute of Environmental Medicine; Karolinska Institutet; Stockholm Sweden
10. Department of Bacteriology and Immunology; University of Helsinki; Helsinki Finland
11. Scientific Research Institute of Physiopulmonology; St. Petersburg Russia