Language The full texts and their abstracts are published in English. So please write your text in good English (American or British usage is accepted, but not a mixture of these). Researchers who are not native speakers of English who submit manuscripts to international journals often receive negative comments from referees or editors about the English-language usage in their manuscripts, and these problems can contribute to a decision to reject a paper. To help reduce the possibility of such problems, we recommend taking at least one of the following steps: •Have your manuscript reviewed for clarity by a colleague whose native language is English. •Use one of the English language editing services that are available.