STEVE INSKEEP, HOST:
This next story begins with an old saying among musicians: If I miss one day of practice, I notice it. If I miss two days, the critics notice it. If I miss three days of practice, the audience will notice. A study found evidence that saying applies to surgeons, and lives may be at stake.
NPR's Shankar Vedantam has been looking at the results of that study. He's in our studios. Hi, Shankar.
SHANKAR VEDANTAM, BYLINE: Good morning, Steve.
INSKEEP: What was the research?