Received: 3 July 2020
Accepted: 7 July 2021
First Online: 16 July 2021
: This study was conducted with the approval of the D414/16, 01.02.2016 of the Ethics Committee of the Medical Faculty of the Christian-Albrechts-Universität zu Kiel. Consent was obtained (as indicated in the Methods section). Written consent to participate was obtained from the parents/guardians of the minors included in this study (minors are considered anyone under the age of 16). Oral consent was obtained from underage study participants. The procedure was approved by the Ethics Committee.
: Not applicable.
: The authors declare that they have no competing interests.