Spirometry, questionnaire and electronic medical record based COPD in a population survey: Comparing prevalence, level of agreement and associations with potential risk factors
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F. Schellevis | D. Heederik | J. Zock | E. Krop | L. Smit | C. Yzermans | C. V. van Dijk | F. Borlée | C. Maassen | J. Rooijackers | B. Aalders | Catharina B. M. Maassen