Funding for this research was provided by:
Banco Santander (Universidad Alfonso X el Sabio)
Text and Data Mining valid from 2020-01-03
Received: 28 August 2019
Accepted: 13 December 2019
First Online: 3 January 2020
Ethics approval and consent to participate
: This original research study was approved by the Ethics Committee of the Universidad Alfonso X El Sabio, Madrid, Spain.
: An informed consent was provided to ensure that the subjects had voluntarily expressed his intention to participate in the investigation, after having understood the information given to him, about the objectives of the study, the benefits, the inconvenience, the possible risks and the alternatives, their rights and responsibilities.
: The authors declare that they have no competing interests.