Text and Data Mining valid from 2020-02-07
Received: 27 June 2019
Accepted: 14 January 2020
First Online: 7 February 2020
Ethics approval and consent to participate
: This was a retrospective analysis of data obtained over a 19-year period. The data were collected anonymously to ensure impartial analysis; therefore, written informed consent was not obtained from the individual participants. The research was approved by the La Paz–Carlos III Hospital’s Ethics Committee.
: Not applicable.
: The authors declare that they have no competing interests.