Funding for this research was provided by:
Netherlands Organization for Health Research and Development (536001007)
Text and Data Mining valid from 2017-09-01
Received: 7 June 2017
Accepted: 20 July 2017
First Online: 1 September 2017
Ethics approval and consent to participate
: Since this study did not meet the criteria for the Medical Research involving Human Subjects act, it was conducted in accordance with the Declaration of Helsinki and the Personal Data Protection Act.
: All authors have provided consent for publication.
: The authors declare that they have no competing interests.