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Carlsen E, Giwercman A, Keiding N, et al. Evidence for decreasing quality of semen during past 50 years. BMJ. 1992;305(6854):609-13doi: 10.1136/bmj.305.6854.609.
Carlsen, E., Giwercman, A., Keiding, N., & Skakkebaek, N. E. (1992). Evidence for decreasing quality of semen during past 50 years. BMJ (Clinical research ed.), 305(6854), 609-13. https://doi.org/10.1136/bmj.305.6854.609
Carlsen, E, et al. "Evidence for decreasing quality of semen during past 50 years." BMJ (Clinical research ed.) vol. 305,6854 (1992): 609-13. doi: https://doi.org/10.1136/bmj.305.6854.609
Carlsen E, Giwercman A, Keiding N, Skakkebaek NE. Evidence for decreasing quality of semen during past 50 years. BMJ. 1992 Sep 12;305(6854):609-13. doi: 10.1136/bmj.305.6854.609. PMID: 1393072; PMCID: PMC1883354.
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