Funding for this research was provided by:
Instituto de Salud Carlos III (PI13/02632)
Article History
Received: 10 March 2019
Accepted: 26 June 2019
First Online: 24 July 2019
Ethics approval and consent to participate
: The protocol for the study was approved by the Clinical Research Ethics Committee of the Basque Country (PI2012072). Written consent was obtained from participants.
: Not Applicable.
: The authors declare that they have no competing interests.