Funding for this research was provided by:
Strategic Program of the National Institute of Public Health and the Environment (S133002)
Received: 7 July 2017
Accepted: 16 April 2018
First Online: 3 May 2018
Ethics approval and consent to participate
: Ethics approval and participation consent was not necessary as this study involved the use of non-publicly accessible de-identified databases according to Dutch privacy law. The authors obtained all necessary Administrative Permission to access the data.
: The authors (EdV, RH, JS and CB) declare that they have no competing interests.
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