- Correspondence to Professor Alberto Ruano Raviña, Department of Preventive Medicine and Public Health, School of Medicine, C/ San Francisco s/n, University of Santiago de Compostela, Santiago de Compostela CP 15782, La Coruña, Spain;
- Received October 24, 2011
- Accepted January 29, 2012
- First published March 10, 2012.
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