Many New York residents believe that the United States health care system is among the best in the world. According to the Institute of Medicine, however, nearly 98,000 people are killed from medical malpractice every year. While some medical errors may be unavoidable, others are caused by acts of negligence. In 2004, a New York woman sued a fertility clinic after giving birth to a baby that was obviously not her husbands. It emerged that the clinic had used semen from a stranger by mistake.