Associations between spirometry-based COPD and potential risk factors and severity measures. BorléeFloor Joris YzermansC. KropEsmeralda AaldersBernadette RooijackersJos ZockJan-Paul E. van DijkChristel MaassenCatharina B. M. SchellevisFrançois HeederikDick A. M. SmitLidwien 2017 <p>COPD is defined on pre-and post-measurements and on LLN-definition and GOLD-definition.</p>