Text and Data Mining valid from 2019-08-26
Received: 12 July 2019
Accepted: 21 August 2019
First Online: 26 August 2019
Compliance with ethical standards
: The authors of this manuscript have no financial statement (having received no financial support for this study) or conflict of interest to disclose.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The study was approved by the ethics research committee of Ferrol-A Coruña (Spain), from where it was coordinated (ethical approval No. 218/342). This article does not contain any studies with animals performed by any of the authors.