Received: 23 August 2020
Revised: 2 November 2020
Accepted: 27 December 2020
First Online: 25 January 2021
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This study has been approved by the appropriate ethics committee and has therefore been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments.
: All patients signed informed consent for anonymous data publication. Cases 1, 2, 5, 6, and 7 also signed informed consent for the videos to be published for scientific purposes.
Free to read: This content has been made available to all.