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APA Citation
Li, J., Yu, X., Zheng, J., Zhao, J., Wang, J., Shen, Y., Li, Y., Yu, J., Li, D., Xu, J., & Zhu, Q. (n.d.). the reproductive health indices and sex hormone levels in middle-aged and elderly Chinese men. Aging male, 19, 143–147. http://access.bl.uk/ark:/81055/vdc_100039238131.0x000055