Received: 14 June 2019
Accepted: 20 September 2019
First Online: 22 October 2019
Ethics approval and consent to participate
: The medical ethics committee of Erasmus Medical Centre, Rotterdam, the Netherlands determined that the rules stipulated in the Medical Research Involving Human Subjects Act did not apply to this study (protocol no. MEC-2018-055).
: Not applicable.
: The authors declare that they have no competing interests.