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  1. Sexually transmitted diseases (STDs) - Symptoms and causes - Mayo Clinic

    They are spread mainly by sexual contact. STIs are caused by bacteria, viruses or parasites. A sexually transmitted infection may pass from person to person in ...

  2. Sexually transmitted diseases (STDs) - Diagnosis and treatment - Mayo Clinic

    ... cancer. Cervical cancer is often caused by certain HPV strains. Experts recommend that women have a Pap test every three years starting at age 21. After age ...

  3. 全美医院

    唯有准确诊断，方可有效治疗。我们的专家诊断并治疗最具有挑战性的医学难题。 全美排名，名列前茅. 根据《美国新闻与世界报道》，妙 ...