Here’s yet another argument for a single, centralized, and nationalized health care system.

Startling research from the biggest study ever of U.S. health care quality suggests that Americans _ rich, poor, black, white _ get roughly equal treatment, but it’s woefully mediocre for all.

“This study shows that health care has equal-opportunity defects,” said Dr. Donald Berwick, who runs the nonprofit Institute for Healthcare Improvement in Cambridge, Mass.

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