- Correspondence to Dr Miguel A Martínez-González, Departamento de Medicina Preventiva y Salud Pública, Edificio de Investigación, Universidad de Navarra, C/Irunlarrea 1. C.P., Pamplona 31008, Spain;
- Received April 3, 2014
- Revised May 27, 2014
- Accepted May 28, 2014
- First published June 24, 2014.
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