Dennis Quaid sat down with "60 Minutes" and opened up about the medical mistake that almost cost his newborn twins their lives at LA's Cedars Sinai hospital. They were lucky, but many patients are not. As Quaid tells Steve Kroft, "100,000 people a year are killed every year in hospitals because of a medical mistake... It's bigger than AIDS. It's bigger than breast cancer. It's bigger than automobile accidents."