Text and Data Mining valid from 2018-11-11
Received: 24 July 2017
Accepted: 6 November 2018
First Online: 11 November 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All procedures performed in this study were in accordance with the ethical standards of the Ethics Committee of the University of Santiago de Compostela and with the 1964 Helsinki declaration. The protocol of this randomized clinical trial was approved by the Ethics Committee of the SERGAS (2015-581).
: Written informed consent was obtained from all participants included in the study.