Álvarez, Josefa Díaz
Matias-Guiu, Jordi A.
Cabrera-Martín, María Nieves
Risco-Martín, José L.
Ayala, José L.
Article History
Received: 12 March 2019
Accepted: 13 August 2019
First Online: 11 October 2019
Ethics approval and consent to participate
: The Institutional Research Ethics Committee from Hospital Clinico San Carlos approved the research protocol with the 1964 Helsinki declaration and its later amendments. Written informed consent was obtained from all individual participants included in the study or their caregivers.
: Not applicable.
: The authors declare that they have no competing interests.