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|issue=4
|pages=157–9
|url=https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3455634/pdf/10815_2004_Article_461193.pdf
|pubmedID=12762415
|pubmedCID=3455634
|doi=10.1023/A:1022933320700
|format=PDF
}}</ref><ref name="HIV"/> Two contrary studies found mixed evidence, including individual cases of a high sperm concentration.<ref name="Killick">{{REFjournal
|last=Killick