Practical course Study procedures and visits Informed consent procedures :The participant or participant's parent(s) / legal representative(s) must be informed by the interviewer about all aspects of the study that are relevant to decide to participate in particular concerning the personal data collection, and must have sufficient time and opportunity to ask any questions. Prior to the interviews, the written Informed Consent form must be signed and personally dated by the participant or participant's parent(s) / legal representative(s).