Avoid speculative observations, but indicate the extent to which additional research may be required to address the central issues raised in the paper. Provide no more than five terms or concepts that reflect the essential content and message of the article. Place notes, references, tables, figures, and figure captions at the end of the article. Each table and figure should be on a separate sheet and specifically cited within the text. Keep titles brief, but clear and descriptive of table contents.
Key table footnotes to the body of the table with symbols rather than numerals or letters.
Include no more than four tables unless reasons for additional tabular material are specified in the cover letter accompanying the manuscript. Only if absolutely necessary should mathematical equations or expressions be included. Keep mathematical notation as simple as possible. References and Notes. All references listed must be cited in text and all text citations must have a reference listed.