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John Kiely, Craig Pickering and Israel Halperin have no conflicts of interest that are directly relevant to the content of this letter.
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Kiely, J., Pickering, C. & Halperin, I. Comment on “Biological Background of Block Periodized Endurance Training: A Review”. Sports Med 49, 1475–1477 (2019). https://doi.org/10.1007/s40279-019-01114-9
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DOI: https://doi.org/10.1007/s40279-019-01114-9