Received: 5 January 2021
Accepted: 9 April 2021
First Online: 27 April 2021
: Following the Dutch legislation (Medical Research Involving Human Subjects Act (WMO)), the nature of this research did not require formal medical ethical approval. However, all methods were carried out in accordance with relevant guidelines and regulations, and informed consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.