Text and Data Mining valid from 2019-11-13
Received: 29 July 2019
Accepted: 26 September 2019
First Online: 13 November 2019
Compliance with ethical standards
: The authors declare that they have no conflicts of interest.
: The Ethical Committee of the Clínico San Carlos Hospital approved the study, as well as by the ethics board of each hospital where necessary. All patients were enrolled in accordance with the Helsinki declaration.
: No individual participant data is reported that would require consent to publish from the participant (or legal parent or guardian for children).