One of the consequences of such a combined estrogenic attack might be a lowering of testosterone levels ( 161 – 163 ) and, in this context, it may be significant that age-adjusted circulating testosterone levels also appear to be reducing with the passage of time in concert with the progressive decline in sperm counts ( 7 , 164 – 166 ).
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What is driving the global decline of human fertility? Need for a multidisciplinary approach to the underlying mechanisms.
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