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  1. Male infertility - Symptoms and causes - Mayo Clinic

  2. Male Infertility: Causes, Symptoms, Tests & Treatment - Cleveland Clinic

  3. What Causes a Man to Have No Sperm in His Semen? - WebMD

  4. Male Infertility - Urology Care Foundation

  5. How common is male infertility, and what are its causes?

  6. Male Infertility - Johns Hopkins Medicine

  7. Male Infertility: Causes, Symptoms and Treatments | U.S. News

  8. Male infertility - Diagnosis and treatment - Mayo Clinic

  9. Male Infertility > Fact Sheets - Yale Medicine

  10. Male Infertility - American Pregnancy Association