Received: 3 September 2021
Accepted: 19 April 2022
First Online: 6 May 2022
: All methods were performed in accordance with the relevant guidelines and regulations. The Medical Ethical Committee of the Leiden University Medical Center approved the study in 1997 (reference number P97/04) and all participants provided fully informed consent with written documents prior to participation.
: Not applicable.
: The authors declare that they have no conflicts of interest.