Ethics approval
73/18
The study was approved by three local ethics committees (Marburg University, 20.08.2018, ref. 73/18; Witten/Herdecke University, 18.09.2018, ref. 146/2018; and Heinrich-Heine-University Düsseldorf, 03.12.2018, ref. 2018–249). We confirm that written informed consent was obtained from all participants and/or their legal guardians. Research has been performed in accordance with the Declaration of Helsinki.