1. Pulmonary Division; Department of Medicine; University of Helsinki and Helsinki University Central Hospital; Helsinki; Finland
2. Department of Pulmonary Medicine; Lapland Central Hospital; Rovaniemi; Finland
3. Medical Informatics Group; University of Oulu; Oulu; Finland
4. Department of Biochemistry; Proteomics Core Facility Biocenter Oulu; University of Oulu; Oulu; Finland
5. Department of Pathology; University of Helsinki and Helsinki University Central Hospital; Helsinki; Finland