Acknowledgements
The authors thank the patients for having collaborated with this study. We are grateful to Itziar Llopis for sample management.
The research leading to these results has received funding from Instituto de Investigación Sanitaria La Fe (2013/0332, PI JFVC/ TS), from Instituto de Salud Carlos III (ISCIII, PI12/0946, PI TS) and from Ministerio de Economía y Competitividad (SAF2014-59469-R; PI: JPT). The Centro de Investigación Biomédica en Red de Enfermedades Raras (CIBERER) and the Centro de Investigación Biomédica en Red en Enfermedades Neurodegenerativas (CIBERNED) are initiatives from the ISCIII.
Declaration of interest
JFVC was funded by Instituto de Investigación La Fe. TS is funded by grants from the ISCIII and IRDiRC. JPT received support from Ministerio de Economía y Competitividad and CIBERNED.