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. 2019 May 14;9(5):e025150. doi: 10.1136/bmjopen-2018-025150

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© Author(s) (or their employer(s)) 2018. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Weekly prevalence of LBP and LBP limiting work ability during the marine training course, reported as weekly proportion (percent) of cohort under study. Error bars indicate 95% CI. LBP, low back pain; WA, work ability; Wk, week.