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. 2019 Feb 2;5(1):e000465. doi: 10.1136/bmjsem-2018-000465

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© Author(s) (or their employer(s)) 2019. 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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The frequencies of the inferred DRD2 rs12364283–rs1076560–DRD4 rs1800955 allele combination. The frequencies (%) between the control group (controls), all clinically diagnosed and self-reported concussed cases (all cases) and clinically diagnosed concussed cases only (clinically diagnosed) for the inferred DRD2 rs12364283 (A>G), DRD2 rs1076560 (C>A) and DRD4 rs1800955 (T>C) allele combinations; in (A) juniors (n=107) and (B) seniors (n=163). Significant differences between groups are indicated (p<0.05, recessive model).