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Collaborators Vladimír Pavlík, Blanka Kupsová, Václav Šafka (Department of Military Internal Medicine and Military Hygiene, Faculty of Military Health Sciences, University of Defence, Hradec Kralove, Czech Republic). Martin Dlouhý, (Department of Physical Education, Faculty of Education, Charles University, Prague, Czech Republic).
Contributors VP: study design, data collection and manuscript writing. VS: data collection. BK: data collection. MD: data collection and manuscript revision. All authors agreed on the final submission.
Funding The work was supported by the Ministry of Defence of the Czech Republic, 'Long Term Organization Development Plan 1011', Clinical Branch II of the Faculty of Military Health Sciences Hradec Kralove, University of Defence, Czech Republic.
Competing interests None declared.
Provenance and peer review Not commissioned; internally peer reviewed.