Borlée, F., Yzermans, C.J., Krop, E., Rooijackers, J., Aalders, B., Zock, J.P., Dijk, C.E. van, Maassen, C.B.M., Schellevis, F., Heederik, D., Smit, L.A.M. Spirometry, questionnaire and electronic medical record based COPD in a population survey: comparing prevalence, level of agreement and associations with potential risk factors. PLoS One: 2017, 12(3)