Received: 17 August 2018
Accepted: 8 May 2019
First Online: 24 May 2019
Ethics approval and consent to participate
: The protocol for this project was submitted to the Ethical committee at the University of Seville and it was approved. All procedures performed were in accordance with the ethical standards of the institution and with the 1964 Helsinki declaration and its subsequent amendments or with comparable ethical standards.
: All participants have given consent for publication.
: The authors declare that they have no conflict of interest.
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