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| Levonorgestrel, administration & dosage (1) |
| Luteinizing Hormone, blood (1) |
| Male (1) |
| progestins (1) |
| Research Support, Non-U.S. Gov't (1) |
| Sperm Count (1) |
| Spermatogenesis, drug effects (1) |
| Spermatozoa, drug effects (1) |
| Testosterone, administration & dosage, analogs & derivatives, blood (1) |