Assessment of the

Letters submitted for possible publication must be identified as such and submitted with a signed trans-fer-of-copyright form (see page 1-5 for location of form). Text length must not exceed 400 words. No more than five references may be used; reference for-mat must be that specified in "Information for Read-ers and Authors. " All parts of letters must be typed double-spaced, including references. Letters not typed double-spaced will not be considered for publication. Tables and figures will not be published. Acceptance of letters for publication depends on several factors: newness of information, relevance to current topics and recent content of this journal, clarity of statement, distribution of topics within this section, conformity to acceptable formats, and space available; only about half of the letters submitted can be published. The Ed-itor reserves the right to shorten letters and make changes to our style. Authors of letters to be published will be notified of their acceptance. Unpublished let-ters are returned only on request