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Wulff H, Duan Y, Wagner P.Wulff H, et al.Int J Environ Res Public Health. 2021 Jun 28;18(13):6938. doi: 10.3390/ijerph18136938.Int J Environ Res Public Health. 2021.PMID: 34203513Free PMC article.
Zhang R, Wulff H, Duan Y, Wagner P.Zhang R, et al. Among authors: wulff h.J Sport Health Sci. 2019 Sep;8(5):412-421. doi: 10.1016/j.jshs.2018.11.002. Epub 2018 Nov 14.J Sport Health Sci. 2019.PMID: 31534816Free PMC article.Review.