Puolakkainen, Tero
Toivari, Miika
Puolakka, Tuukka
Snäll, Johanna
Article History
Received: 13 January 2022
Accepted: 8 June 2022
First Online: 15 June 2022
Declarations
:
: The study was approved by the Internal Review Board of the Head and Neck Center, Helsinki University Hospital, Helsinki, Finland (HUS/356/2017 and HUS/54/2019). All methods were carried out in accordance with relevant guidelines and regulations. Ethics committee of Helsinki University Hospital waived the need for informed consent due to retrospective nature of the study.
: Not applicable
: The authors declare that they have no competing interests.