Text and Data Mining valid from 2019-07-01
Received: 26 March 2019
Accepted: 21 June 2019
First Online: 1 July 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: 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. This article was approved by University Hospital Miguel Servet review board of Zaragoza.
: An informed consent was obtained from all individual participants included in the study.