- Correspondence to Dr Jose M Martínez-Sánchez, Biostatistics Unit, Department of Basic Sciences, Universitat Internacional de Catalunya, Sant Cugat del Vallés, Barcelona, Spain;
- Received May 25, 2015
- Accepted January 25, 2016
- First published February 17, 2016.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.