Use of Copper Intrauterine Devices and the Risk of Tubal Infertility among Nulligravid Women

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Abstract
Previous studies of intrauterine devices (IUDs), many of which are no longer in use, suggested that they might cause tubal infertility. The concern that IUDs that contain copper — currently the most commonly used type — may increase the risk of infertility in nulligravid women has limited the use of this highly effective method of birth control.