Institution: | 1. Department of Pulmonary Diseases, University Central Hospital, Helsinki, Finland 2. Department of Electron Microscopy, University of Helsinki, Mannerheimintie 172, SF-00280, Helsinki 28, Finland 3. Department of Biomedical Sciences, University of Tampere, Box 607, SF-33101, Tampere 10, Finland 4. Department of Public Health, University of Tempere, Box 607, SF-33101, Tampere 10, Finland 5. Research Institute of Military Medicine, Central Military Hospital, Box 5, SF-00281, Helsinki 28, Finland
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