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As an intern 20 years ago, Dr. Sandy Christiansen said, she was repeatedly denied the opportunity to perform some medical procedures that other interns performed.

Dr. Maria Siemionow, head of plastic surgery at the famed Cleveland Clinic, talked with CNN's Larry King about the first face transplant procedure in the United States.

Like many New Yorkers, I remember a time when nearly everyone smoked. In 1950, Collier's reported that more than three-quarters of adult men smoked. This epidemic had a devastating and long-lasting impact on public health.