Received: 19 July 2018
Accepted: 23 July 2019
First Online: 7 August 2019
Ethics approval and consent to participate
: The patient information was anonymized and de-identified prior to the analysis. Local ethics committee (Comité de Ética de la Investigación de la Universidad Rey Juan Carlos) ruled that no formal ethics approval was required in this particular case.
: Not applicable.
: The authors declare that they have no competing interests.