Funding for this research was provided by:
Received: 13 January 2021
Accepted: 29 March 2021
First Online: 17 April 2021
: The present study was approved by the Privacy Review Board of the NCR. According to the Central Committee on Research involving Human Subjects (CCMO), this type of observational study does not require approval from an ethics committee in the Netherlands.
: Not applicable.
: The authors declare that they have no competing interests.