On page 775 of the 28 January 2010 issue, the URL for “www.clinicaltrials.gov” is misspelled in the last sentence of the Abstract. The sentence read, “This trial was registered at www.clinicialtrials.gov as #NCT00274924.” The sentence should have read, “This trial was registered at www.clinicaltrials.gov as #NCT00274924.” The error has been corrected in the online version, which now differs from the print version.

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