Funding for this research was provided by:
Instituto de Salud Carlos III (PI14CIII/00014, PI14/01671, PI17/01791)
Text and Data Mining valid from 2019-07-17
Received: 1 March 2019
Accepted: 5 July 2019
First Online: 17 July 2019
Ethics approval and consent to participate
: The study protocol was approved by the Medical and Health Research Ethics Committee (CEIC) of the Hospital Universitario 12 de Octubre and by the committees of all the other included hospitals. Formal consent was signed for each participant.
: All authors have approved the manuscript for submission.
: The authors declare that they have no competing interests.