Funding for this research was provided by:
KWF Kankerbestrijding (Grant No. UVA 2008-4013)
Received: 14 June 2016
Accepted: 28 December 2017
First Online: 15 January 2018
Ethics approval and consent to participate
: The population-level data we used were freely available to the public and, according to Dutch legislation, no ethical approval was necessary to perform the research.
: Not applicable
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.