Text and Data Mining valid from 2019-03-25
Received: 3 October 2018
Accepted: 17 March 2019
First Online: 25 March 2019
Ethics approval and consent to participate
: The Ethics Committee of the Hospital District of Helsinki and Uusimaa approved the study (267/13/03/09). The current study was based on registry data and no clinical patients were enrolled; therefore, informed consent of the patients was not required. Approval to use the data was granted by Institutional Review Board of the Finnish Defence Forces.
: Not applicable.
: The authors declare that they have no competing interests.
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