Received: 29 April 2020
Accepted: 24 August 2020
First Online: 1 September 2020
Ethics approval and consent to participate
: The local hospital ethical committee (Regionale Toetsingscommissie Patiëntgebonden Onderzoek, Leeuwarden, the Netherlands) waived the need for additional informed consent (nWMO 2020004).
: Consent for publication was not applicable.
: No competing interests.