Text and Data Mining valid from 2018-02-02
First Online: 2 February 2018
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.
: Informed consent was obtained from all individual participants included in the study.
: The study was approved by the Aragon Ethical Committee (Spain). All procedures performed in this study involving human participants were in accordance with the ethical standards of the institutional research committee (Aragon Ethical Committee), and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.