A short title for use as running head is also required. Please also supply phone and fax numbers, as well as your e-mail address. This abstract should consist of four paragraphs, labeled Background, Methods, Results, and Conclusions. They should briefly describe, respectively, the problem being addressed in the study, how the study was performed, the salient results, and what the authors conclude from the results. When essential, they are numbered consecutively and typed at the foot of the appropriate page.
Tables require a heading and figures a legend, also prepared on a separate sheet.
Due to technical reasons, figures with a screen background should not be submitted. On the back of each illustration, indicate its number, the author's name, and 'top' with a soft pencil. Avoid overuse of abbreviations. Introduce an abbreviation only when the same term occurs three or more times. Color illustrations are reproduced at the author's expense.