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Article History

Received: 3 March 2025

Accepted: 20 August 2025

First Online: 9 October 2025

Declarations

:

: The study protocol was approved by the research ethics committee of Nordwest- und Zentralschweiz (EKNZ) (147/13, 2018–01786 and 2018–00549). At baseline, one parent provided written informed consent for their children. Adolescents aged 12 years or older filled in an additional consent form. At follow-up for participants younger than 14 years written informed consent was provided by a parent as a proxy; for participants aged between 14 and 18 years, both parental and an own written informed consent was provided; for adolescents above 18 years only own written informed consent was given.

: Not applicable.

: The authors declare no competing interests.