Gynecology: Intra-Uterine Devices: A New Era in Birth Control?

It has been known for a century that a foreign body in the uterus can prevent conception — at least in animals. But how could such a process work and be put to safe human use? Even though modern medical men have no sure answers, the cautious and respectable Planned Parenthood Federation of America announced last week that its medical advisers are now giving "strong, though preliminary" approval to the newest form of birth control. Information accumulated from more than 10,000 women during 90,000 woman-months of observation, said P.P.F.'s medical committee,...

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