Received: 5 December 2020
Accepted: 23 February 2021
First Online: 8 March 2021
: This is a retrospective analysis of a small group of patients, and the ethics committee approval was not asked, as indicated by Article 9 EU GDPR “Processing of special categories of personal data” Paragraph 1 (j), and Article 89 EU GDPR “Safeguards and derogations relating to processing for archiving purposes in the public interest, scientific or historical research purposes or statistical purposes.”
: Individual personal data are not directly published in the manuscript and, in order to guarantee and respect individual privacy, data do not suggest any recognition of patients.
: The authors declare that they have no competing interests.