Funding for this research was provided by:
Ministerio de Economía, Industria y Competitividad, Gobierno de España (DEP2015-68538-C2-1-R)
Received: 3 September 2019
Accepted: 20 December 2019
First Online: 6 January 2020
Ethics approval and consent to participate
: The study protocol was approved by the local Institutional Human Research Ethics Committee of Vall d’Hebron University Hospital (Ref nº: CEIC/PR AG-174/2014). All participants voluntarily provided written signed informed consent prior to study participation.
: All authors reviewed and approved the final version for submission.
: The authors declare that they have no competing interests.