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Funding The work of OG and FL is funded by Instituto de Salud Carlos III and Xunta de Galicia (SERGAS) through a research-staff stabilisation contract. They are supported by Instituto de Salud Carlos III and Xunta de Galicia (OG grants: PI08/0040 and PGIDIT07PXIB918090PR; FL grants: PI060919, PI08/0044 and PGIDIT06PXIB918307PR). This work was also partially supported by the RETICS Programme, RD08/0075 (RIER) and REDINSCOR via Instituto de Salud Carlos III (ISCIII), within the VI NP of R+D+I 2008–2011.
Competing interests None.
Ethics approval This study was conducted with the approval of the Santiago University Clinical Hospital Ethics Committee.
Provenance and peer review Not commissioned; externally peer reviewed.