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[2] A Male Birth Control Pill Passed Safety Tests — Here's How It Works. Retrieved March 27, 2019, from https://www.livescience.com/65078-male-birth-control-pill-tested-safety.html

[3] 10 Years to a Male Contraceptive?. Retrieved March 27, 2019, from https://www.medscape.com/viewarticle/910887