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Kunz P, Engel FA, Holmberg HC, Sperlich B.Kunz P, et al. Among authors: sperlich b.Sports Med Open. 2019 Feb 21;5(1):7. doi: 10.1186/s40798-019-0180-5.Sports Med Open. 2019.PMID: 30790134Free PMC article.Review.