Received: 22 March 2019
Accepted: 10 June 2019
First Online: 19 June 2019
Ethics approval and consent to participate
: Written approval to conduct this study was received from the medical ethical research committee from the Erasmus MC University Medical Center (Erasmus MC), Rotterdam, the Netherlands (MEC-2015-306).
: Not applicable.
: The authors declare that they have no competing interests.