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. 2014 Jul 9;14:701. doi: 10.1186/1471-2458-14-701

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Copyright © 2014 Jiang et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Correlations of Hb, symptom score, and CMS score with altitude and length of residence at high altitude. (A) Curve fitting analysis of Hb concentration and altitude. (B) Hb concentration in the groups at an altitude of <4500 and ≥4500 m. (C) Curve fitting analysis of Hb concentration and length of exposure to high altitude. (D) Hb concentration in the groups with a length of exposure to high altitude of <60 and ≥60 months. (E) Curve fitting analysis of CMS score and altitude. (F) CMS score in the groups at an altitude of <4500 and ≥4500 m. (G) Curve fitting analysis of CMS score and length of exposure to high altitude. (H) CMS score in the groups with a length of exposure to high altitude of <60 and ≥60 months.