Funding for this research was provided by:
Rijksinstituut voor Volksgezondheid en Milieu (9051 4524)
European Union's Seventh Framework Programme for research, technological development and demonstration (601040)
Text and Data Mining valid from 2018-08-03
Received: 11 December 2017
Accepted: 10 July 2018
First Online: 3 August 2018
Ethics approval and consent to participate
: This retrospective study was approved by our local institutional review board (CMO Arnhem-Nijmegen) and the requirement for informed consent was waived.
: Not applicable.
: The authors declare that they have no competing interests.
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