Text and Data Mining valid from 2019-04-05
Received: 22 January 2019
Accepted: 28 March 2019
First Online: 5 April 2019
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board of the Erasmus Medical Center (127.545/1993/84) and written informed consent was obtained from participants.
: 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.