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Authors
Parkkila, Karri
Kesäniemi, Y. Antero
Ukkola, Olavi
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Article History
Received: 15 November 2022
Accepted: 26 April 2023
First Online: 9 May 2023
Declarations
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: The OPERA project was approved by the Ethical Committee of the Faculty of Medicine, University of Oulu, and was compatible with the Declaration of Helsinki. A written informed consent was obtained from each participant before participation.
: Not applicable.
: The authors declare that they have no competing interests.
