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. 2016 Feb 23;6:21988. doi: 10.1038/srep21988

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Counties with elevational range larger than 6,000 m were excluded in the analysis. The relationship is significant when elevational range is less than 1,900 m (R² = 0.2962, F = 815.2, P < 0.001), beyond which the relationship is marginal (R² = 0.0000, F = 0.02, P = 0.89).