1. Medical Informatics and Statistics Research Group University of Oulu Oulu Finland
2. Ministry of Health and Social Development Murmansk Region Murmansk Russia
3. Monchegorsk City Hospital Murmansk Russia
4. Department of Pulmonary Murmansk Regional Hospital Murmansk Russia
5. Nord–West Science Centre of Public Health Care Murmansk Russia
6. Department of Medicine, Pulmonary Division University of Helsinki Helsinki Finland
7. Department of Pulmonary Medicine Lapland Central Hospital Rovaniemi Finland