Brakema E A, van Gemert F A, van der Kleij R M J J, Salvi S, Puhan M, Chavannes N H
Department of Public Health and Primary Care, Leiden University Medical Center, Leiden University, Leiden, The Netherlands.
Department of General Practice Groningen, Institute for Asthma and COPD, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands.
NPJ Prim Care Respir Med. 2019 Mar 5;29(1):6. doi: 10.1038/s41533-019-0117-y.