Artificial methods in common use include preventing the sperm from reaching the ovum (using condoms, diaphragms, etc), inhibiting ovulation (using oral contraceptive pills), preventing implantation (using intrauterine devices), killing the sperm (using spermicides)
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The cells<span> in this type of carcinoma in situ most commonly appear on areas of the</span>skin<span> exposed to the sun, such as face, ears, and neck. They are more likely to grow deeper into the </span>skin<span>, as well as spread to other areas of the body</span>