Their sperm production had been monitored each month until their sperm count hit 20 million per mL (milliliter), which is considered fertile.

• 这些男士接受此种避孕措施后，其精子数量每个月都被记录下来，直到停药后，其精子水平恢复到每毫升2000万个（该精子水平被认为可生育）。