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Authors
Lund, Teija
Aavikko, Anni
Ristolainen, Leena
Kautiainen, Hannu
Lohman, Martina
Schlenzka, Dietrich
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Funding
Funding for this research was provided by:
University of Helsinki
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Article History
Received: 15 October 2025
Revised: 13 November 2025
Accepted: 24 November 2025
First Online: 3 December 2025
Declarations
:
: The authors declare no competing interests.
: The study followed the Declaration of Helsinki. Ethical approval for the original study was granted by the Ethics Committee of The Invalid Foundation in 1993, with additional permission from the Helsinki school district. The final follow-up protocol was approved by the Ethics Committee of Helsinki University Hospital (protocol 3251/2020). Written informed consent was obtained from legal guardians at baseline and from all individual participants at final follow-up.
