Acknowledgments
Author contributions : NF and JH conceived the study. NF and JH drafted the initial protocol, analyzed the data, and prepared the first draft of the manuscript. All authors collected data and analyzed each maternal death. NF and JH coordinated the study and developed the database and analyzed the data. All authors contributed to the drafting of the manuscript. JH, MD, JK and NS are the guarantors for the study. All authors had full access to all of the data in the study and take responsibility for the integrity of the data and the accuracy of the data analysis.
Competing financial Interest statement: All authors declare that they have no conflict of interest.
Data availability: The data related to this study was collected from medical records, paying attention to confidentiality.
Ethical approval and informed consent: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. The study protocol was approved by the Institutional Review Boards (IRBs) of St Marianna university hospital (No.4543). Written informed consent was obtained from patients. Although the analysis was retrospective and the confidentiality of the patients involved was protected. All patients’ records/information was anonymized and de-identified prior to analysis.