Certificate of Quality

At the end of all documents we provide a link to an online certificate on our WWW site. This confirms to reviewers that your document has been checked by professional editors with English as their first language. We strongly suggest that you keep this link in the end of your document so that it is seen by reviewers. Many reviewers are not native speakers of English, and their comments on English text are often incorrect. You may avoid this problem if the reviewer can confirm that the document has been checked by a professional editing service. The certificate is online so that journals and reviewers can be certain that the certificate applies to the document under review, and you can be sure that reviewers will see the simple http://... link at the end of your document. The link can be deleted from your document when the review process has been completed.