Thrombosis-related characteristics of pregnant women with antithrombin deficiency, protein C deficiency and protein S deficiency in Japan.

"Declarations Ethics approval and consent to participateThe national surveillance of pregnant women with hereditary thrombophilia was approved by the Ethics Committee of Kanazawa University (approval number 890–1) and Hamamatsu Medical Center (rapid approval number 78, 2018). The comparison observational study was approved by the Ethics Committee of Kanazawa University (approval number 1210–1) and Hamamatsu Medical Center (approval number 2021–3-095) and the Ethics Committee of the JSOG (approval number 131). This study was performed in compliance with the Declaration of Helsinki. Consent was not obtained, but all presented data were anonymized and there is no risk of individual identification. Although the ethics committees decided that informed consent was not required due to the retrospective nature of the study, we adopted the opt-out method. Consent for publicationNot applicable. Competing interestsThe authors declare no competing interests. Competing interests The authors declare no competing interests."

"Funding This work was supported by Research Grants from the Ministry of Health, Labour and Welfare of Japan for Blood Coagulation Abnormalities in the Research Program on Rare and Intractable Diseases."