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Markus Gerber, Serge Brand, Magnus Lindwall, Catherine Elliot, Nadeem Kalak, Christian Herrmann, Uwe Pühse, Ingibjörg H. Jonsdottir. (2012) Concerns Regarding Hair Cortisol as a Biomarker of Chronic Stress in Exercise and Sport Science. Journal of Sports Science and Medicine (11), 571 - 581.