- Correspondence to Professor Alberto Ruano-Ravina, Department of Preventive Medicine and Public Health, School of Medicine, University of Santiago de Compostela, C/San Francisco s/n, Santiago de Compostela 15782, Spain;
- Received June 17, 2014
- Revised August 1, 2014
- Accepted August 4, 2014
- First published August 19, 2014.
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