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Digit ratio, especially second to fourth digit ratio (2D:4D) is lower in men than in women. The ratios of digit may be established in utero and is negatively correlated with sperm counts and testosterone in men and positively correlated with estrogen in men and women.To study whether the digit ratio (especially 2D:4D) are associated with the a+b ratio of sperm number in Chinese populations.Photocopies...
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