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Additional file 1: Supplementary Table 1. The International Classification of Diseases (Tenth Revision) andcorresponding MHLW codes for etiologies of PPH. Supplementary Table 2. Etiologiesof patients with severe postpartum hemorrhage by maternal age. Supplementary Table 3. Etiologiesof severe PPH cases that underwent hemostatic procedures between 2013 and 2018. Supplementary Table 4. Etiologiesof severe PPH cases by the type of treatment facilities. Supplementary Table 5. The frequencyof blood transfusion and hemostatic treatments by the type of treatmentfacilities.