To make sure that we can start the clinical trial with a full group, we invite more people than necessary. We do this because it is possible that someone is unexpectedly unable to come or because it turns out that someone no longer meets the conditions of the clinical trial. You will be told upon arrival whether you are a participant or 'reserve' participant; you cannot choose this yourself. If you are a reserve participant, you will be informed the next day whether or not you will actually participate after all. If, as a reserve participant, you do not need to participate after all, you will receive a full travel allowance and appropriate compensation. This 'compensation for reserve participants' is stated in the ICF that you sign at the time of your screening visit.