Received: 16 July 2020
Accepted: 14 May 2021
First Online: 2 June 2021
: This study was conducted according to the guidelines laid down in the Declaration of Helsinki, and all procedures involving human subjects were approved by the Clinical Research Ethics Committee of the CEU San Pablo University (Madrid). The corresponding ethics code is 119/16/08.
: The authors affirm that human research participants provided informed consent for publication of their data.
: The authors declare that they have no conflicts of interest.