Received: 11 December 2020
Accepted: 3 February 2021
First Online: 18 February 2021
Change Date: 14 April 2021
Change Type: Update
Change Details: The original article was missing a statement declaring the funding enabled by Projekt DEAL. The article has been updated to include this funding declaration.
Ethics approval and consent to participate
: All study participants, their parents or legal guardians gave written informed consent. The study has been approved by the Ethics Committee of Hannover Medical School (No. 7804_BO_S_2018).
: This article does not contain any individual person’s data in any form.
: The authors declare that they have no competing interests.
: The original protocol of the study has been made available by publication (BMJ Open 2019, ExternalRef removed).
: The analysis of the diagnostic study was conducted by NR and reviewed by AK at the Institute of Epidemiology and Social Medicine, University of Muenster.