Received: 16 March 2019
Accepted: 27 September 2019
First Online: 12 October 2019
Ethics approval and consent to participate
: All soldiers received oral and written information, and gave written informed consent for their participation. The study was approved by the the local ethics committee in Örebro, Ref. no. 500:16307/0 (2002), and in Stockholm, Ref. no. 2011/928–32 (2012).
: Not applicable.
: The authors declare that they have no competing interests.