Illustrations may be provided as separate files, or embedded in the manuscript text file. Each figure should include a single illustration and should fit on a single page in portrait format. If a figure consists of separate parts, it is important that a single composite illustration file be submitted which contains all parts of the figure. There is no charge for the use of color figures.

The following file formats can be accepted: .pdf, .docx/doc, .xlsx/xls, .zip.

It is the responsibility of the author(s) to obtain permission from the copyright holder to reproduce figures or tables previously published.