Ethics approval and consent to participate
This study was approved by the Medical Ethical Committee of the VU University Medical centre (2018.563). We conducted this study in agreement with the declaration of Helsinki (2013), in accordance with the Dutch Medical Research Involving Human Subjects Act (WMO), and the General Data Protection Regulation (in Dutch: Algemene Verordening Gegevensbescherming, AVG). We obtained written informed consent from each participant, after the information letter was provided. The researchers made sure that the participants were given complete, adequate, written and oral information regarding the nature, aims, possible risks and benefits of the study. We explained to the participants that they were free to interrupt their participation in the study at any moment without any consequence, and that they were able to receive a digital copy of their personal data. Participants received a copy of the information letter and informed consent form. An independent clinician/epidemiologist was appointed to provide participants the opportunity to ask questions about the study. The research protocol and statistical analysis plan are accessible at the Netherlands National Trial Register (