Received: 19 November 2020
Accepted: 21 May 2021
First Online: 1 June 2021
: The Medical Ethics Review Committee of VU University Medical Center was consulted in order to verify whether ethical approval was necessary. As this study did not involve an intervention, the Committee confirmed that the Medical Research Involving Human Subjects Act (WMO) does not apply and that an official approval is not required (protocol number 2020.257). All procedures performed were in accordance with the 1964 Helsinki declaration, its amendments and comparable ethical standards.
: Not applicable.
: The authors declare that they have no competing interests.