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Risk factors for severe disease and impact of severity on pregnant women with COVID-19: a case–control study based on data from a nationwide survey of maternity services in Japan

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Arakaki T, Hasegawa J, Sekizawa A on behalf of the department of medical safety, the Japan Association of Obstetricians and Gynecologists (JAOG), et al
Risk factors for severe disease and impact of severity on pregnant women with COVID-19: a case–control study based on data from a nationwide survey of maternity services in Japan