Acknowledgements
The authors thank P. Zanen, MD, PhD (Department of Respiratory Medicine, University Medical Center Utrecht) for his valuable input on the data analysis. We are grateful to the ten primary care practices and to the practice nurses in these primary care practices for their work on the data collection. The authors would like to thank the patients who participated in this study.
We thank the Department of Data Management of Julius Research (University Medical Center Utrecht) for the help they provided in data management.