Multanen, Juhani
Häkkinen, Arja
Kautiainen, Hannu
Ylinen, Jari
Article History
Received: 30 May 2021
Accepted: 12 October 2021
First Online: 29 October 2021
Declarations
:
: The study protocol followed the guidelines of the Declaration of Helsinki and was approved by the Ethics Committee of the Central Finland Health Care District (protocol approval number 41/2000). Written informed consent was obtained from all participants.
: Not applicable.
: The author declare that they have no competing interests.