Funding for this research was provided by:
Turku University Hospital Fund
Helsinki University Hospital Research Fund
Suomen Hammaslääkäriseura Apollonia
Finnish Cancer Society
Maritza and Reino Salonen Foundation
Received: 26 June 2020
Accepted: 25 August 2020
First Online: 3 September 2020
Ethics approval and consent to participate
: According to the current regulations of the institutional Research Ethics Board, the approval of the study design to retrieve the patients’ clinicopathologic information and scoring of diagnostic and surgical specimens for medical research purposes is granted after permission from the national authorities. These permissions were obtained from the Finnish National Supervisory Authority for Welfare and Health (VALVIRA), and from the Brazilian Human Research Ethics Committee.
: Not applicable.
: None declared.