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We regret that in our paper in the January issue of PLoS Medicine , we failed to cite an important recent study  that validates a simple 5-point quality rating score virtually identical to the one we used, and which we find more efficient than scores with multiple subscales. We apologize for the omission of this helpful research.
Michael Callaham (ude.fscu.enicidem@clm)
University of California San Francisco, San Francisco, California, United States of America
Funding: The author received no specific funding for this article.
Competing Interests: The author has declared that no competing interests exist.