Recruitment strategy
RECRUITMENT
We are contacting all eligible 1590 families (70 families provided at T3 no informed consent for further contact) from the PIER-study via mail to request their renewed participation. Due to the fact, that many former participants will be of legal age and due to the new General Data Protection Regulation (GDPR), it is necessary to obtain renewed written consent. Because the participants were minors at the former measurement points, we only have the address data of the parents. However, the majority of children have presumably not yet finished school or are still in contact with their parents. Therefore, it seems likely that they continue to live at home or can be contacted through their parents. If no valid contact data is available, the residents’ registration office will be contacted to disclose the latest address.Figure Overview of recruitment strategy. The symbol with the cross mark represents the exclusion from participation