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The study protocol was approved by the Institutional Review Board of Second Xiangya Hospital of Central South University, Hunan, China.
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Zou, MX., Lv, GH., Wang, XB. et al. Letter to the Editor concerning “Surgical treatment of sacral chordoma: survival and prognostic factors” by C. Ruosi et al. (Eur Spine J; 2015; 24(Suppl 7):S912–S917. Eur Spine J 26, 281–282 (2017). https://doi.org/10.1007/s00586-016-4819-3
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DOI: https://doi.org/10.1007/s00586-016-4819-3