- Correspondence to Dr Marta Elena Losa Iglesias, Facultad de Ciencias de la Salud, Universidad Rey Juan Carlos, Madrid, Spain;
- Received November 9, 2009
- Revised February 1, 2010
- Accepted February 8, 2010
- First published May 6, 2010.
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.