Received: 23 September 2020
Accepted: 5 January 2021
First Online: 12 January 2021
Ethics approval and consent to participate
: The study was approved by the local ethics Committee (Comitato Etico Regionale per la Sperimentazione Clinica della Regione Toscana, Sezione: AREA VASTA CENTRO, n 12113_oss), that, in keeping with statements by the Italian Regulatory Authorities for retrospective, observational studies (ExternalRef removed), granted a waiver of informed consent from study participants.
: Not applicable.
: The authors declare that they have no competing interests.