Received: 20 December 2020
Accepted: 30 March 2021
First Online: 14 June 2021
: This research was not a clinical study with human subjects as meant in the Medical Research Involving Human Subjects Act as was concluded by the local Medical Ethics Review Board of the University Medical Center Groningen (M17.215918) and no further approval was required.
: Not applicable.
: The authors declare that they have no competing interests.