Received: 30 June 2020
Accepted: 12 November 2020
First Online: 19 November 2020
Ethics approval and consent to participate
: The INR measurement before and after tooth extraction were performed at Kakogawa Central City Hospital as a clinically necessary action, and is not for research. Since this study is a retrospective study, patients did not give informed consent. This study has been conducted in full accordance with the World Medical Association Declaration of Helsinki and was approved by the institutional review board of Kakogawa Central City Hospital (authorization number: 2019-84). The ethics committee approved the procedure of this study and gave us administrative permissions to access the data used in this study.
: Not applicable.
: The authors declare that they have no competing interest.