1. Center for Environmental and Respiratory Health Research (CERH), University of Oulu, Oulu, Finland
2. Medical Research Center Oulu, University of Oulu and Oulu University Hospital, Oulu, Finland
3. Research Unit of Internal Medicine, Medical Research Center Oulu, University of Oulu and Oulu University Hospital, Oulu, Finland
4. Center for Life Course Epidemiology and Systems Medicine, University of Oulu, Oulu, Finland
5. Oulu City Hospital, Oulu, Finland
6. Center for Military Medicine, The Finnish Defence Forces, Helsinki, Finland
7. Unit of General Practice, Oulu University Hospital, Oulu, Finland
8. Research Unit of Biomedicine, and Biocenter Oulu, University of Oulu, Oulu, Finland
9. Department of Gastroenterology and Metabolism, Poznan University of Medical Sciences, Poznan, Poland
10. Center for Life Course Health Research, University of Oulu, Finland
11. Healthcare and Social Services of Selänne, Pyhäjärvi, Finland
12. Finnish Institute of Occupational Health, Oulu, Finland