Se-Mg \> 2,00 mmol/L, smoking cessation less than 1 year prior to study start, submission to hospital within the last two years, submission to hospital with exacerbation during the study period, major changes in eating habits within three months prior to study start and during the study period of approx.one year various conditions (e.g. gastrointestinal disease, kidney disease, pregnancy/lactation) that may affect the study results.
