Material previously published in a letters journal or in a conference proceeding can be included in an article in the Journal that presents significantly more detail and/or results, leading to a substantially improved understanding of the subject. Figures, tables, or text material should not be repeated. Claims of novelty such as "for the first time" should be avoided, even when qualified by escape clauses such as "to our knowledge." Trust the readers to know when something is new and when it is not. Papers must be written in standard American English. This is the responsibility of the author, not the editors. Papers below the standard for the Journal will be returned to the authors for rewriting and can be rejected for this reason alone. Such problems may be avoided and publication expedited if the manuscript is edited by an English-speaking colleague or a professional editing service before the initial submission.