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CMAJ, online 7. Juli 2014; DOI: 10.1503/cmaj.140025
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Urban & Vogel. Das schützt vor COPD. MMW - Fortschritte der Medizin 156, 1 (2014). https://doi.org/10.1007/s15006-014-3230-4
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DOI: https://doi.org/10.1007/s15006-014-3230-4