The PDF file you selected should load here if your Web browser has a PDF reader plug-in installed (for example, a recent version of Adobe Acrobat Reader).

If you would like more information about how to print, save, and work with PDFs, Highwire Press provides a helpful Frequently Asked Questions about PDFs.

Alternatively, you can download the PDF file directly to your computer, from where it can be opened using a PDF reader. To download the PDF, click the Download link above.

Fullscreen Fullscreen Off

Article Metrics

PDF Views.
a description of the source1,714
This journal
104

Metrics powered by PLOS ALM
Bookmark and Share
Copyright (c) 2012 Roberto Ruiz-Barquín, Ricardo de la Vega-Marcos, Javier Poveda, Antonio Rosado, Sidònio Serpa