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A Letter to the Editor must be signed by all authors, typewritten, and double spaced (including references), and must not exceed one and one-half typed pages in length. To be considered for publication, a letter referring to a recent Journal article must be received within a reasonable period after the article's publication. All such correspondence, including the reply of the author or authors, will be subjected to the editorial process, including possible abridgment. However, no letter will be printed without the final approval of the correspondents.