Funding for this research was provided by:
Instituto de Salud Carlos III (CM18/00120)
Received: 12 March 2019
Accepted: 3 July 2019
First Online: 24 July 2019
Ethics approval and consent to participate
: This study was reviewed and approved by the Ethics Committees of of participating centers in accordance with local and national regulations, and was conducted according to International Conference of Harmonization (ICH). The participants (who were all volunteers) provided signed consent after being fully informed of the study goal and its characteristics.
: Not applicable.
: The authors declared that they have no competing interests.