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We invite readers to submit signed letters in response to any published article. Letters are not peer-reviewed, but an Editor or Associate Editor must approve a submitted letter before publication. We do not formally check letters for accuracy: authors are responsible for contents. Publication decisions for letters are entirely at the discretion of the journal's editorial board, and we will not correspond with authors about reasons for non-publication. Letters should generally be brief, not exceeding 500 words. They may contain references if appropriate.

To send us a letter please go to the article you want to respond to and click "Submit a response letter".