Funding source
This work was supported by a grant from ZonMw, the Dutch Organisation for Health Research and Development (project number: 837001508) and sub-funded by a grant from the P.W. Boer Foundation. The study won the Professor Huygen Award 2016 for best study proposal in general practice, which resulted in additional funding. The funders had no role in the data collection, analysis, decision to publish, or preparation of the manuscript. All authors had full access to all study data (including statistical reports and tables) and take responsibility for the integrity of the data and the accuracy of the data analysis.