Received: 28 January 2020
Accepted: 28 June 2020
First Online: 16 July 2020
Ethics approval and consent to participate
: Written informed consent was received from all study participants. The ethical approval for the study was granted by the Central Finland Health Care District, and the Headquarters of the Finnish Defence Forces gave a permission to conduct the study (AM5527).
: Not applicable.
: The authors declare that they have no competing interests.