- Correspondence to Professor Miguel A Martinez-Gonzalez, Departamento de Medicina Preventiva y Salud Pública, Facultad de Medicina-Clínica, Universidad de Navarra, C/ Irunlarrea n1 1, Pamplona, Navarra E-31008, Spain;
- Received 17 December 2012
- Revised 8 March 2013
- Accepted 20 March 2013
- Published online 13 May 2013.
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