Received: 4 April 2019
Accepted: 23 September 2019
First Online: 23 October 2019
Ethics approval and consent to participate
: The Hospital Clinico San Carlos CEIC (Ethics committee) approved the study. Local ethics institutional review board number: Hospital Clinico San Carlos CEIC 14/376. A written informed consent was obtained from all participants.
: Not applicable
: VE is member of the editorial board (Associate Editor) of this journal. The rest of the authors declare no competing interests.