- Correspondence to Dr Esther García-Esquinas, Department of Preventive Medicine and Public Health, School of Medicine Universidad Autónoma de Madrid Calle del Arzobispo Morcillo 4, Madrid 28029, Spain;
- Received January 7, 2016
- Revised March 30, 2016
- Accepted April 15, 2016
- First published May 25, 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.