| http://www.w3.org/ns/prov#value | - ational Collaborating Centre for Women's and Children's Health, 2004].The use of drugs such as anabolic steroids and cocaine can adversely affect the quality of semen.[Dukes, 1996; National Collaborating Centre for Women's and Children's Health, 2004]14.Other factors :Ejaculation disorders, e.g. retrograde ejaculation, impotenceEnvironmental factors which may affect fertility include agricultural
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