- 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 3 April 2014
- Revised 27 May 2014
- Accepted 28 May 2014
- Published online 24 June 2014.
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